SEC Filing | Cabot Corporation

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SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 8)* CABOT CORPORATION (Name of Issuer) COMMON STOCK, PAR VALUE $1.00 PER SHARE (Title of Class of Securities) 127055101 (CUSIP Number) SPO Advisory Corp. 591 Redwood Highway, Suite 3215 Mill Valley, California 94941 (415) 383-6600 with a copy to: Alison S. Ressler Sullivan & Cromwell LLP 1888 Century Park East Los Angeles, California 90067-1725 (310) 712-6600 (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) January 2, 2008 (Date of Event which Requires Filing of This Statement) If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this Schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following box |_|. Note. Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Rule 13d-7 for other parties to whom copies are to be sent. *The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page. The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

Page 2 of 43 pages CUSIP No. 127055101 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON SPO Partners II, L.P. - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS WC - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 9,413,100 (1) ------------------------------------------------------ Number Of Shares 8. SHARED VOTING POWER Beneficially Owned By -0- Each Reporting Person ------------------------------------------------------ With 9. SOLE DISPOSITIVE POWER 9,413,100 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9,413,100 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 14.4% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON PN - -------------------------------------------------------------------------------- (1) Power is exercised through its sole general partner, SPO Advisory Partners, L.P.

Page 3 of 43 pages CUSIP No. 127055101 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON SPO Advisory Partners, L.P. - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS Not Applicable - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 9,413,100 (1)(2) ------------------------------------------------------ Number Of Shares 8. SHARED VOTING POWER Beneficially Owned By -0- Each Reporting Person ------------------------------------------------------ With 9. SOLE DISPOSITIVE POWER 9,413,100 (1)(2) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9,413,100 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 14.4% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON PN - -------------------------------------------------------------------------------- (1) Solely in its capacity as the sole general partner of SPO Partners II, L.P. (2) Power is exercised through its sole general partner, SPO Advisory Corp.

Page 4 of 43 pages CUSIP No. 127055101 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON San Francisco Partners II, L.P. - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS WC - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION California - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 415,600 (1) ------------------------------------------------------ Number Of Shares 8. SHARED VOTING POWER Beneficially Owned By -0- Each Reporting Person ------------------------------------------------------ With 9. SOLE DISPOSITIVE POWER 415,600 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 415,600 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0.6% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON PN - -------------------------------------------------------------------------------- (1) Power is exercised through its sole general partner, SF Advisory Partners, L.P.

Page 5 of 43 pages CUSIP No. 127055101 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON SF Advisory Partners, L.P. - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS Not Applicable - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 415,600 (1)(2) ------------------------------------------------------ Number Of Shares 8. SHARED VOTING POWER Beneficially Owned By -0- Each Reporting Person ------------------------------------------------------ With 9. SOLE DISPOSITIVE POWER 415,600 (1)(2) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 415,600 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0.6% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON PN - -------------------------------------------------------------------------------- (1) Solely in its capacity as the sole general partner of San Francisco Partners II, L.P. (2) Power is exercised through its sole general partner, SPO Advisory Corp.

Page 6 of 43 pages CUSIP No. 127055101 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON SPO Advisory Corp. - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS Not Applicable - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 9,828,700 (1)(2) ------------------------------------------------------ Number Of Shares 8. SHARED VOTING POWER Beneficially Owned By -0- Each Reporting Person ------------------------------------------------------ With 9. SOLE DISPOSITIVE POWER 9,828,700 (1)(2) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9,828,700 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 15.1% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON CO - -------------------------------------------------------------------------------- (1) Solely in its capacity as the sole general partner of SPO Advisory Partners, L.P. with respect to 9,413,100 of such shares; and solely in its capacity as the sole general partner of SF Advisory Partners, L.P. with respect to 415,600 of such shares. (2) Power is exercised through its three controlling persons, John H. Scully, William E. Oberndorf and William J. Patterson.

Page 7 of 43 pages CUSIP No. 127055101 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON John H. Scully - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS Not Applicable - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION USA - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER -0- ------------------------------------------------------ Number Of Shares 8. SHARED VOTING POWER Beneficially Owned By 9,828,700 (1) Each Reporting Person ------------------------------------------------------ With 9. SOLE DISPOSITIVE POWER -0- ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER 9,828,700 (1) - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9,828,700 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 15.1% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON IN - -------------------------------------------------------------------------------- (1) These shares may be deemed to be beneficially owned by Mr. Scully solely in his capacity as one of three controlling persons of SPO Advisory Corp.

Page 8 of 43 pages CUSIP No. 127055101 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON William E. Oberndorf - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS Not Applicable - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION USA - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 219,000 (1) ------------------------------------------------------ Number Of Shares 8. SHARED VOTING POWER Beneficially Owned By 10,162,350 (2) Each Reporting Person ------------------------------------------------------ With 9. SOLE DISPOSITIVE POWER 219,000 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER 10,162,350 (2) - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 10,381,350 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 15.9% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON IN - -------------------------------------------------------------------------------- (1) Of these shares, 109,000 shares are held in William E. Oberndorf's Individual Retirement Account, which is self-directed, 100,000 shares may be deemed to be beneficially owned by Mr. Oberndorf solely in his capacity as sole general partner of Oberndorf Family Partners, a family partnership, and 10,000 shares are owned by Mr. Oberndorf solely in his capacity as trustee for the account of his children. (2) Of these shares, 9,828,700 shares may be deemed to be beneficially owned by Mr. Oberndorf solely in his capacity as one of the three controlling persons of SPO Advisory Corp., and 333,650 shares may be deemed to be beneficially owned by Mr. Oberndorf solely in his capacity as a trustee of the William and Susan Oberndorf Trust, dated 10/19/98.

Page 9 of 43 pages CUSIP No. 127055101 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON William and Susan Oberndorf Trust, dated 10/19/98 - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS PF - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION California - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 333,650 (1) ------------------------------------------------------ Number Of Shares 8. SHARED VOTING POWER Beneficially Owned By -0- Each Reporting Person ------------------------------------------------------ With 9. SOLE DISPOSITIVE POWER 333,650 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 333,650 (1) - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0.6% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON OO - -------------------------------------------------------------------------------- (1) Power is exercised through its trustees, William E. Oberndorf and Susan C. Oberndorf.

Page 10 of 43 pages CUSIP No. 127055101 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON Oberndorf Family Partners - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS WC - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION California - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 100,000 (1) ------------------------------------------------------ Number Of Shares 8. SHARED VOTING POWER Beneficially Owned By -0- Each Reporting Person ------------------------------------------------------ With 9. SOLE DISPOSITIVE POWER 100,000 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 100,000 (1) - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0.2% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON PN - -------------------------------------------------------------------------------- (1) Power is exercised through its sole general partner, William E. Oberndorf.

Page 11 of 43 pages CUSIP No. 127055101 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON William J. Patterson - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS Not Applicable - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION USA - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER -0- ------------------------------------------------------ Number Of Shares 8. SHARED VOTING POWER Beneficially Owned By 9,843,900 (1) Each Reporting Person ------------------------------------------------------ With 9. SOLE DISPOSITIVE POWER -0- ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER 9,843,900 (1) - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9,843,900 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 15.1% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON IN - -------------------------------------------------------------------------------- (1) Of these shares, 9,828,700 shares may be deemed to be beneficially owned by Mr. Patterson solely in his capacity as one of the three controlling persons of SPO Advisory Corp. and 15,200 shares may be deemed to be beneficially owned by Mr. Patterson solely in his capacity as a controlling person, director and executive officer of the Elizabeth R. & William J. Patterson Foundation.

Page 12 of 43 pages CUSIP No. 127055101 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON The Elizabeth R. & William J. Patterson Foundation - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS WC - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION CALIFORNIA - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 15,200 (1) ------------------------------------------------------ Number Of Shares 8. SHARED VOTING POWER Beneficially Owned By 0 Each Reporting Person ------------------------------------------------------ With 9. SOLE DISPOSITIVE POWER 15,200 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER 0 - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 15,200 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) **0.1% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON CO - -------------------------------------------------------------------------------- ** Denotes less than. (1) Power is exercised through its controlling persons, directors and executive officers, William J. Patterson and Elizabeth R. Patterson.

Page 13 of 43 pages CUSIP No. 127055101 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON Ian R. McGuire - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS PF - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION CALIFORNIA - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 475 ------------------------------------------------------ Number Of Shares 8. SHARED VOTING POWER Beneficially Owned By 0 Each Reporting Person ------------------------------------------------------ With 9. SOLE DISPOSITIVE POWER 475 ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER 0 - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 475 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) **0.1% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON IN - -------------------------------------------------------------------------------- ** Denotes less than.

Page 14 of 43 pages CUSIP No. 127055101 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON Betty Jane Weimer - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS PF - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION California - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 5,000 ------------------------------------------------------ Number Of Shares 8. SHARED VOTING POWER Beneficially Owned By -0- Each Reporting Person ------------------------------------------------------ With 9. SOLE DISPOSITIVE POWER 5,000 ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 5,000 - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) **0.1% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON IN - -------------------------------------------------------------------------------- ** Denotes less than.

Page 15 of 43 pages This Amendment No. 8 amends the Schedule 13D (the "Original 13D") filed with the Securities and Exchange Commission ("SEC") on August 29, 2005 and as amended on September 14, 2005, September 26, 2005, October 20, 2005, November 8, 2005, January 12, 2006, June 20, 2006, and December 18, 2007. Unless otherwise stated herein, the Original 13D, as previously amended, remains in full force and effect. Terms used herein and not defined herein shall have the meanings ascribed thereto in the Original 13D. ITEM 3. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION. Item 3 is hereby amended and restated in its entirety as follows: The source and amount of the funds used or to be used by the Reporting Persons to purchase Shares are as follows: NAME SOURCE OF FUNDS AMOUNT OF FUNDS - --------------------- --------------------------- --------------- SPO Contributions from Partners $303,604,172 SPO Advisory Partners Not Applicable Not Applicable SFP Contributions from Partners $ 13,433,286 SF Advisory Partners Not Applicable Not Applicable SPO Advisory Corp. Not Applicable Not Applicable JHS Not Applicable Not Applicable WEO Not Applicable and Personal Funds (1) $ 5,378,674 WJP Not Applicable Not Applicable Oberndorf Trust Personal Funds (1) $ 12,237,424 OFP Contribution from Partners $ 3,635,448 Patterson Foundation Contributions from Shareholders $506,555 IRM Personal Funds (1) $16,877 BJW Personal Funds (1) $ 186,594 - ---------- (1) As used herein, the term "Personal Funds" includes sums borrowed from banks and brokerage firm margin accounts, none of which were borrowed or otherwise obtained for the specified purpose of acquiring, holding, trading or voting Shares. ITEM 5. INTEREST IN SECURITIES OF THE ISSUER. Item 5 is hereby amended and restated in its entirety as follows: (a) Percentage interest calculations for each Reporting Person are based upon the Issuer having 65,294,938 total outstanding shares of Common Stock as reported on the Issuer's 10-K filed with the Securities and Exchange Commission on November 29, 2007. SPO The aggregate number of Shares that SPO owns beneficially, pursuant to Rule 13d-3 of the Act, is 9,413,100 Shares, which constitutes approximately 14.4% of the outstanding Shares. SPO Advisory Partners Because of its position as the sole general partner of SPO, SPO Advisory Partners may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of 9,413,100 Shares, which constitutes approximately 14.4% of the outstanding Shares.

Page 16 of 43 pages SFP The aggregate number of Shares that SFP owns beneficially, pursuant to Rule 13d-3 of the Act, is 415,600 Shares, which constitutes approximately 0.6% of the outstanding Shares. SF Advisory Partners Because of its position as the sole general partner of SFP, SF Advisory Partners may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of 415,600 Shares, which constitutes approximately 0.6% of the outstanding Shares. SPO Advisory Corp. Because of its positions as the sole general partner of each of SPO Advisory Partners and SF Advisory Partners, SPO Advisory Corp. may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of 9,828,700 Shares in the aggregate, which constitutes approximately 15.1% of the outstanding Shares. JHS Because of his position as a control person of SPO Advisory Corp., JHS may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of 9,828,700 Shares, which constitutes approximately 15.1% of the outstanding Shares. WEO Individually, and because of his positions as a control person of SPO Advisory Corp., a trustee of the Oberndorf Trust and sole general partner of OFP and as trustee for the account of his children, WEO may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of 10,381,350 Shares in the aggregate, which constitutes approximately 15.9% of the outstanding Shares. WJP Because of his position as a control person of SPO Advisory Corp. and as a control person, director and executive officer of Patterson Foundation, WJP may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of 9,843,900 Shares, which constitutes approximately 15.1% of the outstanding Shares. Oberndorf Trust The aggregate number of Shares that the Oberndorf Trust owns beneficially, pursuant to Rule 13d-3 of the Act, is 333,650 Shares, which constitutes approximately 0.6% of the outstanding Shares. OFP The aggregate number of Shares that OFP owns beneficially, pursuant to Rule 13d-3 of the Act, is 100,000 Shares, which constitutes approximately 0.2% of the outstanding Shares. Patterson Foundation The aggregate number of Shares that Patterson Foundation owns beneficially, pursuant to Rule 13d-3 of the Act, is 15,200, which constitutes less than 0.1% of the outstanding Shares. IRM The aggregate number of Shares that IRM owns beneficially, pursuant to Rule 13d-3 of the Act, is 475 Shares, which constitutes less than 0.1% of the outstanding Shares. BJW The aggregate number of Shares that BJW owns beneficially, pursuant to Rule 13d-3 of the Act, is 5,000 Shares, which constitutes less than 0.1% of the outstanding Shares.

Page 17 of 43 pages To the best of the knowledge of each of the Reporting Persons, other than as set forth above, none of the persons named in Item 2 hereof is the beneficial owner of any Shares. (b) SPO Acting through its sole general partner, SPO has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 9,413,100 Shares. SPO Advisory Partners Acting through its sole general partner and in its capacity as the sole general partner of SPO, SPO Advisory Partners has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 9,413,100 Shares. SFP Acting through its sole general partner, SFP has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 415,600 Shares. SF Advisory Partners Acting through its sole general partner and in its capacity as the sole general partner of SFP, SF Advisory Partners has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 415,600 Shares. SPO Advisory Corp. Acting through its controlling persons and in its capacities as the sole general partner of each of SPO Advisory Partners and SF Advisory Partners, SPO Advisory Corp. has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 9,828,700 Shares in the aggregate. JHS As one of three controlling persons of SPO Advisory Corp., which is the sole general partner of each of SPO Advisory Partners and SF Advisory Partners, JHS may be deemed to have shared power with WEO and WJP to vote or to direct the vote and to dispose or to direct the disposition of 9,828,700 Shares held by SPO and SFP in the aggregate. WEO As one of three controlling persons of SPO Advisory Corp., which is the sole general partner of each of SPO Advisory Partners and SF Advisory Partners, WEO may be deemed to have shared power with JHS and WJP to vote or to direct the vote and to dispose or to direct the disposition of 9,828,700 Shares held by SPO and SFP in the aggregate. WEO may be deemed to have shared power to vote or to direct the vote and to dispose or to direct the disposition of 333,650 Shares held in the Oberndorf Trust. Individually, and because of his position as the sole general partner of OFP, WEO has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 109,000 Shares held in WEO's Individual Retirement Account, which is self directed, and 100,000 Shares held by OFP. Solely in his capacity as trustee for the account of his children, WEO has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 10,000 shares owned by his children. WJP As one of three controlling persons of SPO Advisory Corp., which is the sole general partner of each of SPO Advisory Partners and SF Advisory Partners, WJP may be deemed to have shared power with JHS and WEO to vote or to direct the vote and to dispose or to direct the disposition of 9,828,700 Shares held by SPO and SFP in the aggregate. WJP may be deemed to have shared power to vote or to direct the vote and to dispose or to direct the disposition of 15,200 Shares held by the Patterson Foundation.

Page 18 of 43 pages Oberndorf Trust Acting through its trustees, Oberndorf Trust has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 333,650 Shares in the aggregate. OFP OFP has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 100,000 Shares. Patterson Foundation Acting through its two controlling persons, directors and executive officers, Patterson Foundation has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 15,200 Shares. IRM IRM has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 475 Shares. BJW BJW has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 5,000 Shares. (c) Since the most recent filing on Schedule 13D, the Reporting Persons purchased Shares in open market transactions as set forth on Schedule I attached hereto. Except as set forth in this paragraph (c), to the best of the knowledge of each of the Reporting Persons, none of the persons named in response to paragraph (a) has effected any transactions in Shares since the most recent filing on Schedule 13D. (d) Each of the Reporting Persons affirms that no person other than such Reporting Person has the right to receive or the power to direct the receipt of distributions with respect to, or the proceeds from the sale of, Shares owned by such Reporting Person. (e) Not applicable. ITEM 7. MATERIAL TO BE FILED AS EXHIBITS. Item 7 is hereby amended and restated in its entirety as follows: Exhibit A: Agreement pursuant to Rule 13d-1(k)

Page 19 of 43 pages SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Dated January 4, 2008 By: /s/ Kim M. Silva -------------------------------- Kim M. Silva Attorney-in-Fact for: SPO PARTNERS II, L.P.(1) SPO ADVISORY PARTNERS, L.P.(1) SAN FRANCISCO PARTNERS II, L.P.(1) SF ADVISORY PARTNERS, L.P.(1) SPO ADVISORY CORP.(1) JOHN H. SCULLY(1) WILLIAM E. OBERNDORF(1) WILLIAM J. PATTERSON(1) WILLIAM AND SUSAN OBERNDORF TRUST, DATED 10/19/98 (1) OBERNDORF FAMILY PARTNERS (1) THE ELIZABETH R. & WILLIAM J. PATTERSON FOUNDATION (1) IAN R. MCGUIRE (1) BETTY JANE WEIMER (1) (1) A Power of Attorney authorizing Kim M. Silva to act on behalf of this person or entity has been previously filed with the Securities and Exchange Commission.

Page 20 of 43 pages SCHEDULE I TO SCHEDULE 13D NUMBER DATE OF OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) EFFECTED - ------------------------------------------ ----------- ---- ------ --------- --------------------- SPO Partners II, L.P. 12/17/2007 Buy 98 32.28 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 195 32.29 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 391 32.30 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 880 32.31 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 684 32.32 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 293 32.33 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 1,271 32.34 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 684 32.35 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 195 32.36 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 195 32.37 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 391 32.38 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 684 32.39 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 391 32.40 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 391 32.41 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 293 32.42 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 586 32.43 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 684 32.44 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 391 32.45 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 1,173 32.46 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 586 32.47 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 684 32.48 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 782 32.49 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 684 32.50 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 293 32.51 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 391 32.52 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 684 32.53 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 489 32.54 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 586 32.55 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 782 32.56 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 880 32.57 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 489 32.58 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 195 32.59 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 293 32.60 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 98 32.62 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 782 32.63 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 98 32.64 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 2,932 32.65 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 195 32.66 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 98 32.67 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 782 32.68 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 195 32.69 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 880 32.70 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 489 32.71 Open Market/Broker

Page 21 of 43 pages SCHEDULE I TO SCHEDULE 13D NUMBER DATE OF OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) EFFECTED - ------------------------------------------ ----------- ---- ------ --------- --------------------- SPO Partners II, L.P. 12/17/2007 Buy 489 32.72 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 391 32.73 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 1,564 32.74 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 2,639 32.75 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 1,466 32.76 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 2,444 32.77 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 1,466 32.78 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 880 32.79 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 1,857 32.80 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 1,564 32.81 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 1,564 32.82 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 2,053 32.83 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 586 32.84 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 586 32.85 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 977 32.86 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 684 32.87 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 1,173 32.88 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 1,173 32.89 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 195 32.90 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 98 32.91 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 880 32.92 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 293 32.93 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 195 32.94 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 586 32.95 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 293 32.96 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 977 32.97 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 1,075 32.98 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 1,662 32.99 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 977 33.00 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 880 33.01 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 391 33.02 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 98 33.03 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 195 33.04 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 293 33.05 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 195 33.06 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 586 33.07 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 293 33.08 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 293 33.09 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 391 33.11 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 489 33.12 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 98 33.13 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 98 33.14 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 293 33.15 Open Market/Broker

Page 22 of 43 pages SCHEDULE I TO SCHEDULE 13D NUMBER DATE OF OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) EFFECTED - ------------------------------------------ ----------- ---- ------ --------- --------------------- SPO Partners II, L.P. 12/17/2007 Buy 98 33.16 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 98 33.17 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 195 33.18 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 293 33.19 Open Market/Broker SPO Partners II, L.P. 12/17/2007 Buy 499 33.20 Open Market/Broker The Elizabeth R. and William J. Patterson 12/17/2007 Buy 2 32.28 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 5 32.29 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 9 32.30 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 20 32.31 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 16 32.32 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 7 32.33 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 29 32.34 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 16 32.35 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 5 32.36 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 5 32.37 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 9 32.38 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 16 32.39 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 9 32.40 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 9 32.41 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 7 32.42 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 14 32.43 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 16 32.44 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 9 32.45 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 27 32.46 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 14 32.47 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 16 32.48 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 18 32.49 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 16 32.50 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 7 32.51 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 9 32.52 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 16 32.53 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 11 32.54 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 14 32.55 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 18 32.56 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 20 32.57 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 11 32.58 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 5 32.59 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 7 32.60 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 2 32.62 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 18 32.63 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 2 32.64 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 68 32.65 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 5 32.66 Open Market/Broker Foundation

Page 23 of 43 pages SCHEDULE I TO SCHEDULE 13D NUMBER DATE OF OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) EFFECTED - ------------------------------------------ ----------- ---- ------ --------- --------------------- The Elizabeth R. and William J. Patterson 12/17/2007 Buy 2 32.67 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 18 32.68 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 5 32.69 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 20 32.70 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 11 32.71 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 11 32.72 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 9 32.73 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 36 32.74 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 61 32.75 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 34 32.76 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 56 32.77 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 34 32.78 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 20 32.79 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 43 32.80 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 36 32.81 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 36 32.82 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 47 32.83 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 14 32.84 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 14 32.85 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 23 32.86 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 16 32.87 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 27 32.88 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 27 32.89 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 5 32.90 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 2 32.91 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 20 32.92 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 7 32.93 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 5 32.94 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 14 32.95 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 7 32.96 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 23 32.97 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 25 32.98 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 38 32.99 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 23 33.00 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 20 33.01 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 9 33.02 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 2 33.03 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 5 33.04 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 7 33.05 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 5 33.06 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 14 33.07 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 7 33.08 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 7 33.09 Open Market/Broker Foundation

Page 24 of 43 pages SCHEDULE I TO SCHEDULE 13D NUMBER DATE OF OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) EFFECTED - ------------------------------------------ ----------- ---- ------ --------- --------------------- The Elizabeth R. and William J. Patterson 12/17/2007 Buy 9 33.11 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 11 33.12 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 2 33.13 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 2 33.14 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 7 33.15 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 2 33.16 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 2 33.17 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 5 33.18 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 7 33.19 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/17/2007 Buy 1 33.20 Open Market/Broker Foundation SPO Partners II, L.P. 12/18/2007 Buy 98 32.62 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 293 32.64 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 196 32.65 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 489 32.66 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 391 32.67 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 685 32.68 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 978 32.69 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 98 32.70 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 196 32.71 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 196 32.73 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 293 32.74 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 587 32.77 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 489 32.79 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 293 32.80 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 293 32.81 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 978 32.82 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 391 32.83 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 587 32.84 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 391 32.85 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 489 32.86 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 196 32.87 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 489 32.88 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 8,413 32.89 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 783 32.90 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 1,174 32.91 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 1,174 32.92 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 1,565 32.93 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 1,467 32.94 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 1,076 32.95 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 1,565 32.96 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 2,641 32.97 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 1,565 32.98 Open Market/Broker

Page 25 of 43 pages SCHEDULE I TO SCHEDULE 13D NUMBER DATE OF OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) EFFECTED - ------------------------------------------ ----------- ---- ------ --------- --------------------- SPO Partners II, L.P. 12/18/2007 Buy 293 32.99 Open Market/Broker SPO Partners II, L.P. 12/18/2007 Buy 688 33.00 Open Market/Broker The Elizabeth R. and William J. Patterson 12/18/2007 Buy 2 32.62 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 7 32.64 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 4 32.65 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 11 32.66 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 9 32.67 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 15 32.68 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 22 32.69 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 2 32.70 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 4 32.71 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 4 32.73 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 7 32.74 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 13 32.77 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 11 32.79 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 7 32.80 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 7 32.81 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 22 32.82 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 9 32.83 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 13 32.84 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 9 32.85 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 11 32.86 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 4 32.87 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 11 32.88 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 187 32.89 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 17 32.90 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 26 32.91 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 26 32.92 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 35 32.93 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 33 32.94 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 24 32.95 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 35 32.96 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 59 32.97 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 35 32.98 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 7 32.99 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/18/2007 Buy 12 33.00 Open Market/Broker Foundation SPO Partners II, L.P. 12/19/2007 Buy 195 33.06 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 195 33.07 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 391 33.08 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 488 33.09 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 44,664 33.10 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 98 33.11 Open Market/Broker

Page 26 of 43 pages SCHEDULE I TO SCHEDULE 13D NUMBER DATE OF OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) EFFECTED - ------------------------------------------ ----------- ---- ------ --------- --------------------- SPO Partners II, L.P. 12/19/2007 Buy 835 33.12 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 879 33.13 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 1,172 33.14 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 1,269 33.15 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 488 33.16 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 293 33.17 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 488 33.18 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 781 33.19 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 1,367 33.20 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 488 33.21 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 683 33.22 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 683 33.23 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 1,757 33.24 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 391 33.25 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 976 33.26 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 683 33.27 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 1,367 33.28 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 1,269 33.29 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 1,562 33.30 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 1,367 33.31 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 1,367 33.32 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 683 33.33 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 1,465 33.34 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 1,269 33.35 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 1,465 33.36 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 1,562 33.37 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 1,660 33.38 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 1,953 33.39 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 1,074 33.40 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 586 33.41 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 1,074 33.42 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 586 33.44 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 195 33.45 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 586 33.46 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 1,074 33.47 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 195 33.48 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 586 33.49 Open Market/Broker SPO Partners II, L.P. 12/19/2007 Buy 391 33.50 Open Market/Broker The Elizabeth R. and William J. Patterson 12/19/2007 Buy 5 33.06 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 5 33.07 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 9 33.08 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 12 33.09 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 1,081 33.10 Open Market/Broker Foundation

Page 27 of 43 pages SCHEDULE I TO SCHEDULE 13D NUMBER DATE OF OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) EFFECTED - ------------------------------------------ ----------- ---- ------ --------- --------------------- The Elizabeth R. and William J. Patterson 12/19/2007 Buy 2 33.11 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 20 33.12 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 21 33.13 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 28 33.14 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 31 33.15 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 12 33.16 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 7 33.17 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 12 33.18 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 19 33.19 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 33 33.20 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 12 33.21 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 17 33.22 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 17 33.23 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 43 33.24 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 9 33.25 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 24 33.26 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 17 33.27 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 33 33.28 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 31 33.29 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 38 33.30 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 33 33.31 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 33 33.32 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 17 33.33 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 35 33.34 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 31 33.35 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 35 33.36 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 38 33.37 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 40 33.38 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 47 33.39 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 26 33.40 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 14 33.41 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 26 33.42 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 14 33.44 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 5 33.45 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 14 33.46 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 26 33.47 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 5 33.48 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 14 33.49 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/19/2007 Buy 9 33.50 Open Market/Broker Foundation SPO Partners II, L.P. 12/20/2007 Buy 397 32.83 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 298 32.84 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 199 32.85 Open Market/Broker

Page 28 of 43 pages SCHEDULE I TO SCHEDULE 13D NUMBER DATE OF OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) EFFECTED - ------------------------------------------ ----------- ---- ------ --------- --------------------- SPO Partners II, L.P. 12/20/2007 Buy 298 32.86 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 596 32.88 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 99 32.89 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 99 32.90 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 199 32.91 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 497 32.92 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 99 32.93 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 397 32.94 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 298 32.95 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 4,271 32.96 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 894 32.97 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 3,139 32.98 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 3,293 32.99 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 3,575 33.00 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 1,092 33.01 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 1,390 33.02 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 397 33.03 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 1,092 33.04 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 1,291 33.05 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 1,490 33.06 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 1,887 33.07 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 1,788 33.08 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 2,682 33.09 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 26,319 33.10 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 1,413 33.11 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 1,986 33.12 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 1,092 33.13 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 1,986 33.14 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 2,483 33.15 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 1,788 33.16 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 1,788 33.17 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 1,688 33.18 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 1,092 33.19 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 1,490 33.20 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 795 33.21 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 1,092 33.22 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 596 33.23 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 1,291 33.24 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 1,092 33.25 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 894 33.26 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 199 33.27 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 1,291 33.28 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 993 33.29 Open Market/Broker

Page 29 of 43 pages SCHEDULE I TO SCHEDULE 13D NUMBER DATE OF OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) EFFECTED - ------------------------------------------ ----------- ---- ------ --------- --------------------- SPO Partners II, L.P. 12/20/2007 Buy 1,092 33.30 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 795 33.31 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 99 33.32 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 99 33.33 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 99 33.34 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 199 33.35 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 99 33.36 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 799 33.37 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 397 33.38 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 298 33.39 Open Market/Broker SPO Partners II, L.P. 12/20/2007 Buy 99 33.40 Open Market/Broker The Elizabeth R. and William J. Patterson 12/20/2007 Buy 3 32.83 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 2 32.84 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 1 32.85 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 2 32.86 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 4 32.88 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 1 32.89 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 1 32.90 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 1 32.91 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 3 32.92 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 1 32.93 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 3 32.94 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 2 32.95 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 29 32.96 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 6 32.97 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 22 32.98 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 23 32.99 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 25 33.00 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 8 33.01 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 10 33.02 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 3 33.03 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 8 33.04 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 9 33.05 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 10 33.06 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 13 33.07 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 12 33.08 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 18 33.09 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 181 33.10 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 10 33.11 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 14 33.12 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 8 33.13 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 14 33.14 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 17 33.15 Open Market/Broker Foundation

Page 30 of 43 pages SCHEDULE I TO SCHEDULE 13D NUMBER DATE OF OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) EFFECTED - ------------------------------------------ ----------- ---- ------ --------- --------------------- The Elizabeth R. and William J. Patterson 12/20/2007 Buy 12 33.16 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 12 33.17 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 12 33.18 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 8 33.19 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 10 33.20 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 5 33.21 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 8 33.22 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 4 33.23 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 9 33.24 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 8 33.25 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 6 33.26 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 1 33.27 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 9 33.28 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 7 33.29 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 8 33.30 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 5 33.31 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 1 33.32 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 1 33.33 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 1 33.34 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 1 33.35 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 1 33.36 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 1 33.37 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 3 33.38 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 2 33.39 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/20/2007 Buy 1 33.40 Open Market/Broker Foundation SPO Partners II, L.P. 12/21/2007 Buy 400 33.27 Open Market/Broker SPO Partners II, L.P. 12/21/2007 Buy 400 33.28 Open Market/Broker SPO Partners II, L.P. 12/21/2007 Buy 2,700 33.29 Open Market/Broker SPO Partners II, L.P. 12/21/2007 Buy 1,600 33.30 Open Market/Broker SPO Partners II, L.P. 12/21/2007 Buy 2,200 33.31 Open Market/Broker SPO Partners II, L.P. 12/21/2007 Buy 3,000 33.32 Open Market/Broker SPO Partners II, L.P. 12/21/2007 Buy 2,200 33.33 Open Market/Broker SPO Partners II, L.P. 12/21/2007 Buy 1,800 33.34 Open Market/Broker SPO Partners II, L.P. 12/21/2007 Buy 1,700 33.35 Open Market/Broker SPO Partners II, L.P. 12/21/2007 Buy 700 33.36 Open Market/Broker SPO Partners II, L.P. 12/21/2007 Buy 600 33.37 Open Market/Broker SPO Partners II, L.P. 12/21/2007 Buy 1,200 33.38 Open Market/Broker SPO Partners II, L.P. 12/21/2007 Buy 600 33.39 Open Market/Broker SPO Partners II, L.P. 12/21/2007 Buy 600 33.40 Open Market/Broker SPO Partners II, L.P. 12/21/2007 Buy 600 33.41 Open Market/Broker SPO Partners II, L.P. 12/21/2007 Buy 300 33.42 Open Market/Broker SPO Partners II, L.P. 12/21/2007 Buy 100 33.43 Open Market/Broker

Page 31 of 43 pages SCHEDULE I TO SCHEDULE 13D NUMBER DATE OF OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) EFFECTED - ------------------------------------------ ----------- ---- ------ --------- --------------------- SPO Partners II, L.P. 12/21/2007 Buy 200 33.45 Open Market/Broker SPO Partners II, L.P. 12/21/2007 Buy 400 33.46 Open Market/Broker SPO Partners II, L.P. 12/21/2007 Buy 500 33.47 Open Market/Broker SPO Partners II, L.P. 12/21/2007 Buy 300 33.48 Open Market/Broker SPO Partners II, L.P. 12/21/2007 Buy 500 33.49 Open Market/Broker SPO Partners II, L.P. 12/21/2007 Buy 2,400 33.50 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 195 33.06 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 98 33.07 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 195 33.08 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 98 33.09 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 195 33.10 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 390 33.11 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 293 33.12 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 98 33.14 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 98 33.15 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 293 33.17 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 488 33.18 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 195 33.19 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 195 33.20 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 293 33.21 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 98 33.22 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 195 33.23 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 98 33.24 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 390 33.25 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 390 33.26 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 293 33.27 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 390 33.28 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 390 33.29 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 488 33.30 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 293 33.31 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 195 33.32 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 195 33.33 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 195 33.35 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 293 33.36 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 195 33.37 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 488 33.38 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 390 33.39 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 781 33.40 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 1,464 33.41 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 683 33.42 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 878 33.43 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 878 33.44 Open Market/Broker

Page 32 of 43 pages SCHEDULE I TO SCHEDULE 13D NUMBER DATE OF OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) EFFECTED - ------------------------------------------ ----------- ---- ------ --------- --------------------- SPO Partners II, L.P. 12/24/2007 Buy 1,756 33.45 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 1,366 33.46 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 585 33.47 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 781 33.48 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 488 33.49 Open Market/Broker SPO Partners II, L.P. 12/24/2007 Buy 2,340 33.50 Open Market/Broker The Elizabeth R. and William J. Patterson 12/24/2007 Buy 5 33.06 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 2 33.07 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 5 33.08 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 2 33.09 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 5 33.10 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 10 33.11 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 7 33.12 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 2 33.14 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 2 33.15 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 7 33.17 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 12 33.18 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 5 33.19 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 5 33.20 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 7 33.21 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 2 33.22 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 5 33.23 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 2 33.24 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 10 33.25 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 10 33.26 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 7 33.27 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 10 33.28 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 10 33.29 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 12 33.30 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 7 33.31 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 5 33.32 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 5 33.33 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 5 33.35 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 7 33.36 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 5 33.37 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 12 33.38 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 10 33.39 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 19 33.40 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 36 33.41 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 17 33.42 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 22 33.43 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 22 33.44 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 44 33.45 Open Market/Broker Foundation

Page 33 of 43 pages SCHEDULE I TO SCHEDULE 13D NUMBER DATE OF OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) EFFECTED - ------------------------------------------ ----------- ---- ------ --------- --------------------- The Elizabeth R. and William J. Patterson 12/24/2007 Buy 34 33.46 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 15 33.47 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 19 33.48 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 12 33.49 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/24/2007 Buy 60 33.50 Open Market/Broker Foundation SPO Partners II, L.P. 12/26/2007 Buy 97 33.45 Open Market/Broker SPO Partners II, L.P. 12/26/2007 Buy 97 33.46 Open Market/Broker SPO Partners II, L.P. 12/26/2007 Buy 195 33.47 Open Market/Broker SPO Partners II, L.P. 12/26/2007 Buy 97 33.48 Open Market/Broker SPO Partners II, L.P. 12/26/2007 Buy 97 33.49 Open Market/Broker SPO Partners II, L.P. 12/26/2007 Buy 390 33.50 Open Market/Broker SPO Partners II, L.P. 12/26/2007 Buy 487 33.57 Open Market/Broker SPO Partners II, L.P. 12/26/2007 Buy 2,924 33.58 Open Market/Broker SPO Partners II, L.P. 12/26/2007 Buy 1,072 33.59 Open Market/Broker SPO Partners II, L.P. 12/26/2007 Buy 487 33.60 Open Market/Broker SPO Partners II, L.P. 12/26/2007 Buy 975 33.61 Open Market/Broker SPO Partners II, L.P. 12/26/2007 Buy 780 33.62 Open Market/Broker SPO Partners II, L.P. 12/26/2007 Buy 585 33.63 Open Market/Broker SPO Partners II, L.P. 12/26/2007 Buy 1,364 33.64 Open Market/Broker SPO Partners II, L.P. 12/26/2007 Buy 585 33.65 Open Market/Broker SPO Partners II, L.P. 12/26/2007 Buy 585 33.66 Open Market/Broker SPO Partners II, L.P. 12/26/2007 Buy 390 33.67 Open Market/Broker SPO Partners II, L.P. 12/26/2007 Buy 97 33.68 Open Market/Broker SPO Partners II, L.P. 12/26/2007 Buy 97 33.69 Open Market/Broker SPO Partners II, L.P. 12/26/2007 Buy 487 33.70 Open Market/Broker SPO Partners II, L.P. 12/26/2007 Buy 195 33.71 Open Market/Broker SPO Partners II, L.P. 12/26/2007 Buy 390 33.72 Open Market/Broker SPO Partners II, L.P. 12/26/2007 Buy 390 33.73 Open Market/Broker SPO Partners II, L.P. 12/26/2007 Buy 877 33.74 Open Market/Broker SPO Partners II, L.P. 12/26/2007 Buy 1,560 33.75 Open Market/Broker The Elizabeth R. and William J. Patterson 12/26/2007 Buy 3 33.45 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/26/2007 Buy 3 33.46 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/26/2007 Buy 5 33.47 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/26/2007 Buy 3 33.48 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/26/2007 Buy 3 33.49 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/26/2007 Buy 10 33.50 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/26/2007 Buy 13 33.57 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/26/2007 Buy 76 33.58 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/26/2007 Buy 28 33.59 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/26/2007 Buy 13 33.60 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/26/2007 Buy 25 33.61 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/26/2007 Buy 20 33.62 Open Market/Broker Foundation

Page 34 of 43 pages SCHEDULE I TO SCHEDULE 13D NUMBER DATE OF OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) EFFECTED - ------------------------------------------ ----------- ---- ------ --------- --------------------- The Elizabeth R. and William J. Patterson 12/26/2007 Buy 15 33.63 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/26/2007 Buy 36 33.64 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/26/2007 Buy 15 33.65 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/26/2007 Buy 15 33.66 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/26/2007 Buy 10 33.67 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/26/2007 Buy 3 33.68 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/26/2007 Buy 3 33.69 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/26/2007 Buy 13 33.70 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/26/2007 Buy 5 33.71 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/26/2007 Buy 10 33.72 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/26/2007 Buy 10 33.73 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/26/2007 Buy 23 33.74 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/26/2007 Buy 40 33.75 Open Market/Broker Foundation SPO Partners II, L.P. 12/27/2007 Buy 195 33.13 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 195 33.14 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 390 33.15 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 293 33.17 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 195 33.18 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 683 33.19 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 683 33.20 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 683 33.21 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 1,073 33.22 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 1,268 33.23 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 683 33.24 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 1,171 33.25 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 1,561 33.26 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 1,171 33.27 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 293 33.28 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 976 33.29 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 1,268 33.30 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 1,171 33.31 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 683 33.32 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 1,171 33.33 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 976 33.34 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 878 33.35 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 1,463 33.36 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 488 33.37 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 1,463 33.38 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 1,463 33.39 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 1,659 33.40 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 683 33.41 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 683 33.42 Open Market/Broker

Page 35 of 43 pages SCHEDULE I TO SCHEDULE 13D NUMBER DATE OF OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) EFFECTED - ------------------------------------------ ----------- ---- ------ --------- --------------------- SPO Partners II, L.P. 12/27/2007 Buy 1,073 33.43 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 781 33.44 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 1,268 33.45 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 4,390 33.46 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 5,073 33.47 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 3,707 33.48 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 4,195 33.49 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 6,049 33.50 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 1,268 33.51 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 976 33.52 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 585 33.53 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 488 33.54 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 195 33.55 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 195 33.56 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 195 33.58 Open Market/Broker SPO Partners II, L.P. 12/27/2007 Buy 100 33.59 Open Market/Broker The Elizabeth R. and William J. Patterson 12/27/2007 Buy 5 33.13 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 5 33.14 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 10 33.15 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 7 33.17 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 5 33.18 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 17 33.19 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 17 33.20 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 17 33.21 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 27 33.22 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 32 33.23 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 17 33.24 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 29 33.25 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 39 33.26 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 29 33.27 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 7 33.28 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 24 33.29 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 32 33.30 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 29 33.31 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 17 33.32 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 29 33.33 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 24 33.34 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 22 33.35 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 37 33.36 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 12 33.37 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 37 33.38 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 37 33.39 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 41 33.40 Open Market/Broker Foundation

Page 36 of 43 pages SCHEDULE I TO SCHEDULE 13D NUMBER DATE OF OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) EFFECTED - ------------------------------------------ ----------- ---- ------ --------- --------------------- The Elizabeth R. and William J. Patterson 12/27/2007 Buy 17 33.41 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 17 33.42 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 27 33.43 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 19 33.44 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 32 33.45 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 110 33.46 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 127 33.47 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 93 33.48 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 105 33.49 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 151 33.50 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 32 33.51 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 24 33.52 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 15 33.53 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 12 33.54 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 5 33.55 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 5 33.56 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy 5 33.58 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/27/2007 Buy - 33.59 Open Market/Broker Foundation SPO Partners II, L.P. 12/28/2007 Buy 293 33.21 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 195 33.22 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 293 33.23 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 781 33.24 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 391 33.25 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 683 33.26 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 683 33.27 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 1,172 33.28 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 2,384 33.29 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 5,468 33.30 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 1,660 33.31 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 1,269 33.32 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 683 33.33 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 488 33.34 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 1,172 33.35 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 586 33.36 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 976 33.37 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 683 33.38 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 195 33.39 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 586 33.40 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 195 33.41 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 683 33.42 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 391 33.43 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 195 33.44 Open Market/Broker

Page 37 of 43 pages SCHEDULE I TO SCHEDULE 13D NUMBER DATE OF OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) EFFECTED - ------------------------------------------ ----------- ---- ------ --------- --------------------- SPO Partners II, L.P. 12/28/2007 Buy 976 33.45 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 391 33.46 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 488 33.48 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 391 33.49 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 586 33.50 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 98 33.58 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 683 33.59 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 879 33.60 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 293 33.61 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 391 33.62 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 488 33.63 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 488 33.64 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 683 33.65 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 391 33.66 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 488 33.67 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 586 33.68 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 391 33.69 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 195 33.70 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 683 33.71 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 1,074 33.72 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 683 33.73 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 1,269 33.74 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 2,343 33.75 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 293 33.77 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 98 33.78 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 98 33.80 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 195 33.81 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 195 33.82 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 293 33.83 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 293 33.84 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 683 33.85 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 1,660 33.86 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 1,269 33.87 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 879 33.88 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 1,269 33.89 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 1,172 33.90 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 976 33.91 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 2,831 33.92 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 1,953 33.93 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 2,986 33.94 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 3,222 33.95 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 2,831 33.96 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 2,831 33.97 Open Market/Broker

Page 38 of 43 pages SCHEDULE I TO SCHEDULE 13D NUMBER DATE OF OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) EFFECTED - ------------------------------------------ ----------- ---- ------ --------- --------------------- SPO Partners II, L.P. 12/28/2007 Buy 5,077 33.98 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 1,953 33.99 Open Market/Broker SPO Partners II, L.P. 12/28/2007 Buy 100 34.00 Open Market/Broker The Elizabeth R. and William J. Patterson 12/28/2007 Buy 7 33.21 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 5 33.22 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 7 33.23 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 19 33.24 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 9 33.25 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 17 33.26 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 17 33.27 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 28 33.28 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 58 33.29 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 132 33.30 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 40 33.31 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 31 33.32 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 17 33.33 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 12 33.34 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 28 33.35 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 14 33.36 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 24 33.37 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 17 33.38 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 5 33.39 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 14 33.40 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 5 33.41 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 17 33.42 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 9 33.43 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 5 33.44 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 24 33.45 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 9 33.46 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 12 33.48 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 9 33.49 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 14 33.50 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 2 33.58 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 17 33.59 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 21 33.60 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 7 33.61 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 9 33.62 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 12 33.63 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 12 33.64 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 17 33.65 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 9 33.66 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 12 33.67 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 14 33.68 Open Market/Broker Foundation

Page 39 of 43 pages SCHEDULE I TO SCHEDULE 13D NUMBER DATE OF OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) EFFECTED - ------------------------------------------ ----------- ---- ------ --------- --------------------- The Elizabeth R. and William J. Patterson 12/28/2007 Buy 9 33.69 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 5 33.70 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 17 33.71 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 26 33.72 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 17 33.73 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 31 33.74 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 57 33.75 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 7 33.77 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 2 33.78 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 2 33.80 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 5 33.81 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 5 33.82 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 7 33.83 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 7 33.84 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 17 33.85 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 40 33.86 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 31 33.87 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 21 33.88 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 31 33.89 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 28 33.90 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 24 33.91 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 69 33.92 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 47 33.93 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 72 33.94 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 78 33.95 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 69 33.96 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 69 33.97 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 123 33.98 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy 47 33.99 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/28/2007 Buy - 34.00 Open Market/Broker Foundation SPO Partners II, L.P. 12/31/2007 Buy 198 33.31 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 198 33.32 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 99 33.33 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 198 33.35 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 297 33.36 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 99 33.37 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 495 33.38 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 1,584 33.40 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 1,980 33.41 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 1,386 33.42 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 5,346 33.43 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 6,633 33.44 Open Market/Broker

Page 40 of 43 pages SCHEDULE I TO SCHEDULE 13D NUMBER DATE OF OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) EFFECTED - ------------------------------------------ ----------- ---- ------ --------- --------------------- SPO Partners II, L.P. 12/31/2007 Buy 4,950 33.45 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 6,336 33.45 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 8,217 33.46 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 8,910 33.47 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 3,168 33.48 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 3,366 33.49 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 3,168 33.50 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 1,584 33.51 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 1,683 33.52 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 1,386 33.53 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 594 33.54 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 1,584 33.56 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 1,386 33.57 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 1,386 33.58 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 3,267 33.59 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 3,168 33.60 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 1,089 33.61 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 10,494 33.61 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 1,386 33.62 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 5,148 33.63 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 594 33.64 Open Market/Broker SPO Partners II, L.P. 12/31/2007 Buy 7,623 33.65 Open Market/Broker The Elizabeth R. and William J. Patterson 12/31/2007 Buy 2 33.31 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 2 33.32 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 1 33.33 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 2 33.35 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 3 33.36 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 1 33.37 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 5 33.38 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 16 33.40 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 20 33.41 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 14 33.42 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 54 33.43 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 67 33.44 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 50 33.45 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 64 33.45 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 83 33.46 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 90 33.47 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 32 33.48 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 34 33.49 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 32 33.50 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 16 33.51 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 17 33.52 Open Market/Broker Foundation

Page 41 of 43 pages SCHEDULE I TO SCHEDULE 13D NUMBER DATE OF OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) EFFECTED - ------------------------------------------ ----------- ---- ------ --------- --------------------- The Elizabeth R. and William J. Patterson 12/31/2007 Buy 14 33.53 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 6 33.54 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 16 33.56 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 14 33.57 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 14 33.58 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 33 33.59 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 32 33.60 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 11 33.61 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 106 33.61 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 14 33.62 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 52 33.63 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 6 33.64 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 12/31/2007 Buy 77 33.65 Open Market/Broker Foundation SPO Partners II, L.P. 01/02/2008 Buy 3,604 32.68 Open Market/Broker SPO Partners II, L.P. 01/02/2008 Buy 195 32.69 Open Market/Broker SPO Partners II, L.P. 01/02/2008 Buy 97 32.70 Open Market/Broker SPO Partners II, L.P. 01/02/2008 Buy 2,630 32.73 Open Market/Broker SPO Partners II, L.P. 01/02/2008 Buy 1,169 32.75 Open Market/Broker SPO Partners II, L.P. 01/02/2008 Buy 195 32.76 Open Market/Broker SPO Partners II, L.P. 01/02/2008 Buy 487 32.80 Open Market/Broker SPO Partners II, L.P. 01/02/2008 Buy 97 32.81 Open Market/Broker SPO Partners II, L.P. 01/02/2008 Buy 2,012 32.82 Open Market/Broker SPO Partners II, L.P. 01/02/2008 Buy 812 32.83 Open Market/Broker SPO Partners II, L.P. 01/02/2008 Buy 779 32.84 Open Market/Broker SPO Partners II, L.P. 01/02/2008 Buy 195 32.85 Open Market/Broker SPO Partners II, L.P. 01/02/2008 Buy 195 32.86 Open Market/Broker SPO Partners II, L.P. 01/02/2008 Buy 682 32.87 Open Market/Broker SPO Partners II, L.P. 01/02/2008 Buy 877 32.88 Open Market/Broker SPO Partners II, L.P. 01/02/2008 Buy 97 32.89 Open Market/Broker SPO Partners II, L.P. 01/02/2008 Buy 4,684 32.90 Open Market/Broker SPO Partners II, L.P. 01/02/2008 Buy 19,577 32.91 Open Market/Broker SPO Partners II, L.P. 01/02/2008 Buy 10,958 32.92 Open Market/Broker SPO Partners II, L.P. 01/02/2008 Buy 158 32.93 Open Market/Broker SPO Partners II, L.P. 01/02/2008 Buy 2,873 32.94 Open Market/Broker SPO Partners II, L.P. 01/02/2008 Buy 1,864 32.95 Open Market/Broker SPO Partners II, L.P. 01/02/2008 Buy 3,370 32.96 Open Market/Broker SPO Partners II, L.P. 01/02/2008 Buy 9,743 32.97 Open Market/Broker SPO Partners II, L.P. 01/02/2008 Buy 6,136 32.98 Open Market/Broker SPO Partners II, L.P. 01/02/2008 Buy 3,207 32.99 Open Market/Broker SPO Partners II, L.P. 01/02/2008 Buy 20,627 33.00 Open Market/Broker SPO Partners II, L.P. 01/02/2008 Buy 80 33.05 Open Market/Broker The Elizabeth R. and William J. Patterson 01/02/2008 Buy 96 32.68 Open Market/Broker Foundation

Page 42 of 43 pages SCHEDULE I TO SCHEDULE 13D NUMBER DATE OF OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) EFFECTED - ------------------------------------------ ----------- ---- ------ --------- --------------------- The Elizabeth R. and William J. Patterson 01/02/2008 Buy 5 32.69 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 01/02/2008 Buy 3 32.70 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 01/02/2008 Buy 70 32.73 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 01/02/2008 Buy 31 32.75 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 01/02/2008 Buy 5 32.76 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 01/02/2008 Buy 13 32.80 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 01/02/2008 Buy 3 32.81 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 01/02/2008 Buy 54 32.82 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 01/02/2008 Buy 22 32.83 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 01/02/2008 Buy 21 32.84 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 01/02/2008 Buy 5 32.85 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 01/02/2008 Buy 5 32.86 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 01/02/2008 Buy 18 32.87 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 01/02/2008 Buy 23 32.88 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 01/02/2008 Buy 3 32.89 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 01/02/2008 Buy 125 32.90 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 01/02/2008 Buy 523 32.91 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 01/02/2008 Buy 292 32.92 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 01/02/2008 Buy 4 32.93 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 01/02/2008 Buy 77 32.94 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 01/02/2008 Buy 50 32.95 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 01/02/2008 Buy 90 32.96 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 01/02/2008 Buy 260 32.97 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 01/02/2008 Buy 164 32.98 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 01/02/2008 Buy 86 32.99 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 01/02/2008 Buy 551 33.00 Open Market/Broker Foundation The Elizabeth R. and William J. Patterson 01/02/2008 Buy 1 33.05 Open Market/Broker Foundation

Page 43 of 43 pages EXHIBIT INDEX EXHIBIT DOCUMENT DESCRIPTION PAGE NO. - ------- ------------------------------------ -------- A Agreement Pursuant to Rule 13d-1(k) 1

                                    EXHIBIT A

         Pursuant to Rule 13d-1(k) of Regulation 13D-G of the General Rules and
Regulations of the Securities and Exchange Commission under the Securities
Exchange Act of 1934, as amended, the undersigned agrees that the statement to
which this Exhibit is attached is filed on behalf of each of them in the
capacities set forth below.


Dated January 4, 2008                    By:       /s/ Kim M. Silva
                                               --------------------------------
                                                   Kim M. Silva

                                           Attorney-in-Fact for:

                                           SPO PARTNERS II, L.P.(1)
                                           SPO ADVISORY PARTNERS, L.P.(1)
                                           SAN FRANCISCO PARTNERS II, L.P.(1)
                                           SF ADVISORY PARTNERS, L.P.(1)
                                           SPO ADVISORY CORP.(1)
                                           JOHN H. SCULLY(1)
                                           WILLIAM E. OBERNDORF(1)
                                           WILLIAM J. PATTERSON(1)
                                           WILLIAM AND SUSAN OBERNDORF TRUST,
                                           DATED 10/19/98 (1)
                                           OBERNDORF FAMILY PARTNERS (1)
                                           THE ELIZABETH R. & WILLIAM J.
                                             PATTERSON FOUNDATION (1)
                                           IAN R. MCGUIRE (1)
                                           BETTY JANE WEIMER (1)

                                           (1) A Power of Attorney
                                           authorizing Kim M. Silva to
                                           act on behalf of this
                                           person or entity has been previously
                                           filed with the Securities and
                                           Exchange Commission.