SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 3)* LAMAR ADVERTISING COMPANY (Name of Issuer) CLASS A COMMON STOCK, PAR VALUE $0.001 PER SHARE (Title of Class of Securities) 512815101 (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) JULY 26, 2007 (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 1 of 26 pages -------------------------------------------------------------------------------- 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(e) OR 2(f) |_| -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 8,727,100 (1) ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED -0- BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 8,727,100 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 8,727,100 (1) -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 10.55% -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON PN -------------------------------------------------------------------------------- (1) Power is exercised through its sole general partner, SPO Advisory Partners, L.P. CUSIP No. 512815101 Page 2 of 26 pages -------------------------------------------------------------------------------- 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(e) OR 2(f) |_| -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 8,727,100 (1)(2) ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED -0- BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 8,727,100 (1)(2) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 8,727,100 (1)(2) -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 10.55% -------------------------------------------------------------------------------- 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. CUSIP No. 512815101 Page 3 of 26 pages -------------------------------------------------------------------------------- 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(e) OR 2(f) |_| -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION California -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 461,130 (1) ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED -0- BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 461,130 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 461,130 (1) -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0.56% -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON PN -------------------------------------------------------------------------------- (1) Power is exercised through its sole general partner, SF Advisory Partners, L.P. CUSIP No. 512815101 Page 4 of 26 pages -------------------------------------------------------------------------------- 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(e) OR 2(f) |_| -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 461,130 (1)(2) ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED -0- BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 461,130 (1)(2) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 461,130 (1)(2) -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0.56% -------------------------------------------------------------------------------- 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. CUSIP No. 512815101 Page 5 of 26 pages -------------------------------------------------------------------------------- 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(e) OR 2(f) |_| -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 9,188,230 (1) ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED -0- BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 9,188,230 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9,188,230 (1)(2) -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 11.11% -------------------------------------------------------------------------------- 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 8,727,100 of such shares; and solely in its capacity as the sole general partner of SF Advisory Partners, L.P. with respect to 461,130 of such shares. (2) Power is exercised through its three controlling persons, John H. Scully, William E. Oberndorf and William J. Patterson. CUSIP No. 512815101 Page 6 of 26 pages -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON John 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(e) OR 2(f) |_| -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION USA -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 139,000 (1) ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED 9,188,230 (2) BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 139,000 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER 9,188,230 (2) -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9,327,230 (1)(2) -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 11.28% -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON IN -------------------------------------------------------------------------------- (1) Of these shares, 1,600 shares are held in the John H. Scully Individual Retirement Accounts, which are self-directed, and 137,400 shares may be deemed to be beneficially owned by Mr. Scully solely in his capacity as controlling person, sole director and executive officer of Phoebe Snow Foundation, Inc. (2) 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. CUSIP No. 512815101 Page 7 of 26 pages -------------------------------------------------------------------------------- 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(e) OR 2(f) |_| -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION USA -------------------------------------------------------------------------------- 7. SOLE VOTING POWER -0- ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED 9,188,230 (1) BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER -0- ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER 9,188,230 (1) -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9,188,230 (1) -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 11.11% -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON IN -------------------------------------------------------------------------------- (1) These shares may be deemed to be beneficially owned by Mr. Oberndorf solely in his capacity as one of three controlling persons of SPO Advisory Corp. CUSIP No. 512815101 Page 8 of 26 pages -------------------------------------------------------------------------------- 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(e) OR 2(f) |_| -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION USA -------------------------------------------------------------------------------- 7. SOLE VOTING POWER -0- ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED 9,194,830 (1) BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER -0- ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER 9,194,830 (1) -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9,194,830 (1) -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 11.12% -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON IN -------------------------------------------------------------------------------- (1) Of these shares, 9,188,230 shares may be deemed to be beneficially owned by Mr. Patterson solely in his capacity as one of three controlling persons of SPO Advisory Corp. and 6,600 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. CUSIP No. 512815101 Page 9 of 26 pages -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON Phoebe Snow Foundation, Inc. -------------------------------------------------------------------------------- 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 137,400 (1) ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED -0- BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 137,400 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 137,400 (1) -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0.17% -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON CO -------------------------------------------------------------------------------- (1) Power is exercised through its controlling person, sole director and executive officer, John H. Scully. CUSIP No. 512815101 Page 10 of 26 pages -------------------------------------------------------------------------------- 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 6,600 (1) ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED -0- BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 6,600 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 6,600 (1) -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0.01%** -------------------------------------------------------------------------------- 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. CUSIP No. 512815101 Page 11 of 26 pages -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON Eli J. Weinberg -------------------------------------------------------------------------------- 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(f) |_| -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION USA -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 120 ------------------------------------------------------ NUMBER OF SHARES 8. SHARED VOTING POWER BENEFICIALLY OWNED -0- BY EACH REPORTING ------------------------------------------------------ PERSON WITH 9. SOLE DISPOSITIVE POWER 120 ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 120 -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) **0.01% -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON IN -------------------------------------------------------------------------------- ** Denotes less than. Page 12 of 26 pages This Amendment No. 3 amends the Schedule 13D (the "Original 13D") filed with the Securities and Exchange Commission ("SEC") on August 22, 2005 and as amended on May 10, 2006 and July 19, 2006. Unless otherwise stated herein, the Original 13D, as previously amended, remains in full force and effect. Terms used therein and not defined herein shall have the meanings ascribed thereto in the Original 13D. ITEM 2. IDENTITY AND BACKGROUND. Item 2(a) is hereby amended and restated in its entirety as follows: (a) The undersigned hereby file this Schedule 13D Statement on behalf of SPO Partners II, L.P., a Delaware limited partnership ("SPO"), SPO Advisory Partners, L.P., a Delaware limited partnership ("SPO Advisory Partners"), San Francisco Partners II, L.P., a California limited partnership ("SFP"), SF Advisory Partners, L.P., a Delaware limited partnership ("SF Advisory Partners"), SPO Advisory Corp., a Delaware corporation ("SPO Advisory Corp."), John H. Scully ("JHS"), William E. Oberndorf ("WEO"), William J. Patterson ("WJP"), Phoebe Snow Foundation, Inc., a California corporation ("PS Foundation"), The Elizabeth R. & William J. Patterson Foundation, a California corporation ("Patterson Foundation") and Eli J. Weinberg ("EJW"). SPO, SPO Advisory Partners, SFP, SF Advisory Partners, SPO Advisory Corp., JHS, WEO, WJP, PS Foundation, Patterson Foundation and EJW are sometimes hereinafter referred to as the "Reporting Persons." The Reporting Persons are making this single, joint filing because they may be deemed to constitute a "group" within the meaning of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the "Act"), although neither the fact of this filing nor anything contained herein shall be deemed to be an admission by the Reporting Persons that a group exists. The following subsections are hereby added to Item 2(b)-(c) in appropriate alphabetical order as follows: PATTERSON FOUNDATION Patterson Foundation is a California corporation, the principal purpose of which is to be a private, grant-making charitable entity. WJP and his wife, Elizabeth R. Patterson, are the controlling persons, directors and executive officers of Patterson Foundation. Pursuant to Instruction C to Schedule 13D of the Act, certain information with respect to WJP is set forth herein. The principal business address of Patterson Foundation, which also serves as its principal office, is 591 Redwood Highway, Suite 3215, Mill Valley, California 94941. Ms. Patterson's business address is 591 Redwood Highway, Suite 3215, Mill Valley, California 94941. Ms. Patterson's present principal occupation is homemaker. PS FOUNDATION PS Foundation is a California corporation, whose principal purpose of which is to be a private, grant-making charitable entity. The principal business address of PS Foundation, which also serves as its principal office, is 591 Redwood Highway, Suite 3215, Mill Valley, California 94941. Pursuant to Instruction C to Schedule 13D of the Act, certain information with respect to JHS, sole director and controlling person of PS Foundation, is set forth herein. Page 13 of 26 pages EJW EJW's business address is 591 Redwood Highway, Suite 3215, Mill Valley, California 94941. His present principal occupation is as a principal for SPO Partners & Co. 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 $396,252,898 SPO Advisory Partners Not Applicable Not Applicable SFP Contributions from Partners $20,047,591 SF Advisory Partners Not Applicable Not Applicable SPO Advisory Corp. Not Applicable Not Applicable JHS Not Applicable and Personal Funds $93,010 WEO Not Applicable Not Applicable WJP Not Applicable Not Applicable PS Foundation Contributions from Shareholders $7,988,193 Patterson Foundation Contributions from Shareholders $383,717 EJW Personal Funds $5,282 ITEM 5. INTEREST IN SECURITIES OF THE ISSUER. (a) Percentage interest calculations for each Reporting Person are based upon the Issuer having 82,701,402 total outstanding shares of Class A common stock as reported on the Issuer's 10-Q filed with the Securities and Exchange Commission on May 10, 2007. SPO The aggregate number of Shares that SPO owns beneficially, pursuant to Rule 13d-3 of the Act, is 8,727,100 Shares, which constitutes approximately 10.55% 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 8,727,100 Shares, which constitutes approximately 10.55% of the outstanding Shares. SFP The aggregate number of Shares that SFP owns beneficially, pursuant to Rule 13d-3 of the Act, is 461,130 Shares, which constitutes approximately 0.56% of the outstanding Shares. Page 14 of 26 pages 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 461,130 Shares, which constitutes approximately 0.56% 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 9,188,230 Shares in the aggregate, which constitutes approximately 11.11% of the outstanding Shares. JHS Individually, and because of his positions as a control person of SPO Advisory Corp. and controlling person, sole director and executive officer of PS Foundation, JHS may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of 9,327,230 Shares, which constitutes approximately 11.28% of the outstanding Shares. WEO Because of his position as a control person of SPO Advisory Corp., WEO may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of 9,188,230 Shares, which constitutes approximately 11.11% of the outstanding Shares. WJP Individually and 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 9,194,830 Shares, which constitutes approximately 11.12% of the outstanding Shares. PS FOUNDATION The aggregate number of Shares that PS Foundation owns beneficially, pursuant to Rule 13d-3 of the Act, is 137,400 Shares, which constitutes approximately 0.17% of the outstanding Shares. Page 15 of 26 pages PATTERSON FOUNDATION The aggregate number of Shares that Patterson Foundation owns beneficially, pursuant to Rule 13d-3 of the Act, is 6,600 Shares, which constitutes less than 0.01% of the outstanding Shares. EJW The aggregate number of Shares that EJW owns beneficially, pursuant to Rule 13d-3 of the Act, is 120 Shares, which constitutes less than 0.01% of the outstanding Shares. 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 8,727,100 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 8,727,100 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 461,130 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 461,130 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 9,188,230 Shares in the aggregate. Page 16 of 26 pages 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 9,188,230 Shares held by SPO and SFP in the aggregate. In addition, JHS has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 1,600 Shares held in the John H. Scully Individual Retirement Accounts, which are self-directed individual retirement accounts, and 137,400 Shares held by the PS Foundation, for which JHS is the controlling person, sole director and executive officer. 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 9,188,230 Shares held by SPO and SFP in the aggregate. 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 9,188,230 Shares held by SPO and SFP in the aggregate. In addition, WJP may be deemed to have shared power to vote or to direct the vote and to dispose or to direct the disposition of 6,600 Shares held by the Patterson Foundation. PS FOUNDATION Acting through its controlling person, PS Foundation has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 137,400 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 6,600 Shares. EJW EJW has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 120 Shares. (c) Within the past 60 days of the date of this statement, Reporting Persons purchased Shares in open market transactions on the Nasdaq Global Select Market as set forth on Schedule I attached hereto. Page 17 of 26 pages 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 during the past 60 days. (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) Exhibit B: Power of Attorney Page 18 of 26 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 July 30, 2007 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) PHOEBE SNOW FOUNDATION, INC.(2) THE ELIZABETH R. & WILLIAM J. PATTERSON FOUNDATION(2) ELI J. WEINBERG(2) (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. (2) A Power of Attorney authorizing Kim M. Silva to act on behalf of this person or entity is filed as Exhibit B. Page 19 of 26 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. DATE OF NUMBER OF PRICE PER WHERE/HOW REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) TRANSACTION EFFECTED --------------------------- ----------- ---- --------- --------- -------------------- SPO Partners II, L.P. 7/26/2007 Buy 7,083 58.0000 Open Market/Broker SPO Partners II, L.P. 7/26/2007 Buy 24 58.0100 Open Market/Broker SPO Partners II, L.P. 7/26/2007 Buy 433 58.0200 Open Market/Broker SPO Partners II, L.P. 7/26/2007 Buy 289 58.0300 Open Market/Broker SPO Partners II, L.P. 7/26/2007 Buy 457 58.0400 Open Market/Broker SPO Partners II, L.P. 7/26/2007 Buy 96 58.0600 Open Market/Broker SPO Partners II, L.P. 7/26/2007 Buy 96 58.0700 Open Market/Broker SPO Partners II, L.P. 7/26/2007 Buy 72 58.0800 Open Market/Broker SPO Partners II, L.P. 7/26/2007 Buy 553 58.0900 Open Market/Broker SPO Partners II, L.P. 7/26/2007 Buy 404 58.1000 Open Market/Broker SPO Partners II, L.P. 7/26/2007 Buy 808 58.1100 Open Market/Broker SPO Partners II, L.P. 7/26/2007 Buy 1,203 58.1150 Open Market/Broker SPO Partners II, L.P. 7/26/2007 Buy 20,194 58.1200 Open Market/Broker SPO Partners II, L.P. 7/26/2007 Buy 289 58.1225 Open Market/Broker SPO Partners II, L.P. 7/26/2007 Buy 1,781 58.1300 Open Market/Broker SPO Partners II, L.P. 7/26/2007 Buy 813 58.1400 Open Market/Broker SPO Partners II, L.P. 7/26/2007 Buy 5,417 58.1500 Open Market/Broker SPO Partners II, L.P. 7/26/2007 Buy 1,604 58.1600 Open Market/Broker SPO Partners II, L.P. 7/26/2007 Buy 994 58.1700 Open Market/Broker SPO Partners II, L.P. 7/26/2007 Buy 576 58.1800 Open Market/Broker SPO Partners II, L.P. 7/26/2007 Buy 1,084 58.1900 Open Market/Broker SPO Partners II, L.P. 7/26/2007 Buy 192 58.1950 Open Market/Broker SPO Partners II, L.P. 7/26/2007 Buy 1,905 58.2000 Open Market/Broker SPO Partners II, L.P. 7/26/2007 Buy 24 58.2050 Open Market/Broker SPO Partners II, L.P. 7/26/2007 Buy 1,683 58.2100 Open Market/Broker SPO Partners II, L.P. 7/26/2007 Buy 1,316 58.2200 Open Market/Broker SPO Partners II, L.P. 7/26/2007 Buy 2,269 58.2300 Open Market/Broker Page 20 of 26 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. DATE OF NUMBER OF PRICE PER WHERE/HOW REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) TRANSACTION EFFECTED --------------------------- ----------- ---- --------- --------- -------------------- SPO Partners II, L.P. 7/26/2007 Buy 873 58.2400 Open Market/Broker SPO Partners II, L.P. 7/26/2007 Buy 3,268 58.2500 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 4,392 58.0000 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 15 58.0100 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 268 58.0200 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 179 58.0300 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 283 58.0400 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 60 58.0600 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 60 58.0700 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 45 58.0800 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 343 58.0900 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 251 58.1000 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 501 58.1100 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 746 58.1150 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 12,522 58.1200 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 179 58.1225 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 1,104 58.1300 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 504 58.1400 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 3,359 58.1500 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 995 58.1600 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 616 58.1700 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 357 58.1800 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 672 58.1900 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 119 58.1950 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 1,181 58.2000 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 15 58.2050 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 1,044 58.2100 Open Market/Broker Page 21 of 26 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. DATE OF NUMBER OF PRICE PER WHERE/HOW REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) TRANSACTION EFFECTED --------------------------- ----------- ---- --------- --------- -------------------- San Francisco Partners II, L.P. 7/26/2007 Buy 816 58.2200 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 1,407 58.2300 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 542 58.2400 Open Market/Broker San Francisco Partners II, L.P. 7/26/2007 Buy 2,025 58.2500 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 16,960 58.0000 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 57 58.0100 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 1,036 58.0200 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 690 58.0300 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 1,095 58.0400 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 230 58.0600 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 230 58.0700 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 173 58.0800 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 1,324 58.0900 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 967 58.1000 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 1,935 58.1100 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 2,879 58.1150 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 48,349 58.1200 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 690 58.1225 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 4,264 58.1300 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 1,947 58.1400 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 12,968 58.1500 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 3,840 58.1600 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 2,379 58.1700 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 1,380 58.1800 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 2,597 58.1900 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 462 58.1950 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 4,562 58.2000 Open Market/Broker Page 22 of 26 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. DATE OF NUMBER OF PRICE PER WHERE/HOW REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) TRANSACTION EFFECTED --------------------------- ----------- ---- --------- --------- -------------------- Phoebe Snow Foundation, Inc. 7/26/2007 Buy 57 58.2050 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 4,031 58.2100 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 3,152 58.2200 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 5,433 58.2300 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 2,091 58.2400 Open Market/Broker Phoebe Snow Foundation, Inc. 7/26/2007 Buy 7,821 58.2500 Open Market/Broker The Elizabeth R. & William J. 7/26/2007 Buy 812 58.0000 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/26/2007 Buy 3 58.0100 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/26/2007 Buy 50 58.0200 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/26/2007 Buy 33 58.0300 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/26/2007 Buy 52 58.0400 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/26/2007 Buy 11 58.0600 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/26/2007 Buy 11 58.0700 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/26/2007 Buy 8 58.0800 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/26/2007 Buy 63 58.0900 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/26/2007 Buy 46 58.1000 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/26/2007 Buy 93 58.1100 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/26/2007 Buy 138 58.1150 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/26/2007 Buy 2,316 58.1200 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/26/2007 Buy 33 58.1225 Open Market/Broker Patterson Foundation Page 23 of 26 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. DATE OF NUMBER OF PRICE PER WHERE/HOW REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) TRANSACTION EFFECTED --------------------------- ----------- ---- --------- --------- -------------------- The Elizabeth R. & William J. 7/26/2007 Buy 204 58.1300 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/26/2007 Buy 93 58.1400 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/26/2007 Buy 621 58.1500 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/26/2007 Buy 184 58.1600 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/26/2007 Buy 114 58.1700 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/26/2007 Buy 66 58.1800 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/26/2007 Buy 124 58.1900 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/26/2007 Buy 22 58.1950 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/26/2007 Buy 219 58.2000 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/26/2007 Buy 3 58.2050 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/26/2007 Buy 193 58.2100 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/26/2007 Buy 151 58.2200 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/26/2007 Buy 260 58.2300 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/26/2007 Buy 100 58.2400 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/26/2007 Buy 377 58.2500 Open Market/Broker Patterson Foundation John H. Scully's IRA 7/26/2007 Buy 13 58.0000 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 1 58.0200 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 1 58.0300 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 1 58.0400 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 1 58.0900 Open Market/Broker Page 24 of 26 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. DATE OF NUMBER OF PRICE PER WHERE/HOW REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) TRANSACTION EFFECTED --------------------------- ----------- ---- --------- --------- -------------------- John H. Scully's IRA 7/26/2007 Buy 1 58.1000 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 1 58.1100 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 2 58.1150 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 36 58.1200 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 1 58.1225 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 3 58.1300 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 1 58.1400 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 10 58.1500 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 3 58.1600 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 2 58.1700 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 1 58.1800 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 2 58.1900 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 3 58.2000 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 3 58.2100 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 2 58.2200 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 4 58.2300 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 2 58.2400 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 6 58.2500 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 190 58.0000 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 1 58.0100 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 12 58.0200 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 8 58.0300 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 12 58.0400 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 3 58.0600 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 3 58.0700 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 2 58.0800 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 15 58.0900 Open Market/Broker Page 25 of 26 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. DATE OF NUMBER OF PRICE PER WHERE/HOW REPORTING PERSON TRANSACTION TYPE SHARES SHARE ($) TRANSACTION EFFECTED --------------------------- ----------- ---- --------- --------- -------------------- John H. Scully's IRA 7/26/2007 Buy 11 58.1000 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 22 58.1100 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 32 58.1150 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 543 58.1200 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 8 58.1225 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 48 58.1300 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 22 58.1400 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 146 58.1500 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 43 58.1600 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 27 58.1700 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 15 58.1800 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 29 58.1900 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 5 58.1950 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 51 58.2000 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 1 58.2050 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 45 58.2100 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 35 58.2200 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 61 58.2300 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 23 58.2400 Open Market/Broker John H. Scully's IRA 7/26/2007 Buy 87 58.2500 Open Market/Broker Phoebe Snow Foundation, Inc. 7/27/2007 Buy 950 58.0000 Open Market/Broker Phoebe Snow Foundation, Inc. 7/27/2007 Buy 2,850 58.5000 Open Market/Broker The Elizabeth R. & William J. 7/27/2007 Buy 50 58.0000 Open Market/Broker Patterson Foundation The Elizabeth R. & William J. 7/27/2007 Buy 150 58.5000 Open Market/Broker Patterson Foundation Page 26 of 26 pages EXHIBIT INDEX EXHIBIT DOCUMENT DESCRIPTION ------- -------------------- A Agreement Pursuant to Rule 13d-1 (k) B Power of Attorney