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Debt and Other Financing Arrangements (Summary of Company's Senior Notes) (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2011 | Dec. 31, 2010
Senior notes | $ 3,332,263 | [1] | $ 3,391,668 | [1]
Debt Instrument, Fair Value | 3,244,674 |  | 3,227,404 |
Unsecured Senior Notes 8.125% Due February 2011 [Member] |  |  |  |
Senior notes |  |  | 13,900 | [2]
Debt interest rate | 8.125% |  | 8.125% |
Debt maturity date | February 2011 |  | February 2011 |
Unsecured Senior Notes 5.45% Due August 2012 [Member] |  |  |  |
Senior notes | 97,116 | [3] | 104,823 | [3]
Debt interest rate | 5.45% |  | 5.45% |
Debt maturity date | August 2012 |  | August 2012 |
Unsecured Senior Notes 6.25% Due February 2013 [Member] |  |  |  |
Senior notes | 62,647 | [3] | 62,617 | [3]
Debt interest rate | 6.25% |  | 6.25% |
Debt maturity date | February 2013 |  | February 2013 |
Unsecured Senior Notes 5.125% Due October 2013 [Member] |  |  |  |
Senior notes | 116,545 | [3] | 160,212 | [3]
Debt interest rate | 5.125% |  | 5.125% |
Debt maturity date | October 2013 |  | October 2013 |
Unsecured Senior Notes 5.25% Due January 2014 [Member] |  |  |  |
Senior notes | 335,859 | [3] | 335,848 | [3]
Debt interest rate | 5.25% |  | 5.25% |
Debt maturity date | January 2014 |  | January 2014 |
Unsecured Senior Notes 5.7% Due May 2014 [Member] |  |  |  |
Senior notes | 310,474 | [3] | 309,048 | [3]
Debt interest rate | 5.70% |  | 5.70% |
Debt maturity date | May 2014 |  | May 2014 |
Unsecured Senior Notes 5.2% Due January 2015 [Member] |  |  |  |
Senior notes | 244,862 | [3] | 244,839 | [3]
Debt interest rate | 5.20% |  | 5.20% |
Debt maturity date | January 2015 |  | January 2015 |
Unsecured Senior Notes 5.25% Due June 2015 [Member] |  |  |  |
Senior notes | 400,702 | [3] | 397,700 | [3]
Debt interest rate | 5.25% |  | 5.25% |
Debt maturity date | June 2015 |  | June 2015 |
Unsecured Senior Notes 6.5% Due May 2016 [Member] |  |  |  |
Senior notes | 467,894 | [3] | 466,644 | [3]
Debt interest rate | 6.50% |  | 6.50% |
Debt maturity date | May 2016 |  | May 2016 |
Unsecured Senior Notes 7.625% Due September 2017 [Member] |  |  |  |
Senior notes | 149,319 | [2] | 149,265 | [2]
Debt interest rate | 7.625% |  | 7.625% |
Debt maturity date | September 2017 |  | September 2017 |
Unsecured Senior Notes 7.875% Due May 2032 [Member] |  |  |  |
Senior notes | 299,087 | [3] | 299,065 | [3]
Debt interest rate | 7.875% |  | 7.875% |
Debt maturity date | May 2032 |  | May 2032 |
Unsecured Senior Notes 6.375% Due May 2033 [Member] |  |  |  |
Senior notes | 398,381 | [3] | 398,344 | [3]
Debt interest rate | 6.375% |  | 6.375% |
Debt maturity date | May 2033 |  | May 2033 |
Unsecured Senior Notes 6% Due January 2035 [Member] |  |  |  |
Senior notes | 299,377 | [3] | 299,363 | [3]
Debt interest rate | 6.00% |  | 6.00% |
Debt maturity date | January 2035 |  | January 2035 |
Unsecured Senior Notes 7.375% Due June 2046 [Member] |  |  |  |
Senior notes | $ 150,000 | [3] | $ 150,000 | [3]
Debt interest rate | 7.375% |  | 7.375% |
Debt maturity date | June 2046 |  | June 2046 |
[1] | The recorded carrying value reflects the impact of various discounts and premiums that are amortized to interest cost over the respective terms of the senior notes
[2] | Not redeemable prior to maturity, guaranteed on a senior basis by certain wholly-owned subsidiaries
[3] | Redeemable prior to maturity, guaranteed on a senior basis by certain wholly-owned subsidiaries

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13476-108611 + Details
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- Definition Interest rate stated in the contractual debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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