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Debt (Summary Of Company's Senior Notes) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Debt Instrument |  |  |  |
Senior note carrying value | $ 3,090,946 | [1] | $ 3,088,344 | [1]
Unsecured Senior Notes 8.125% Due February 2011 [Member] |  |  |  |
Debt Instrument |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.125% |  | 8.125% |
Unsecured Senior Notes 5.45% Due August 2012 [Member] |  |  |  |
Debt Instrument |  |  |  |
Senior note carrying value | 96,634 | [2] | 96,795 | [2]
Debt Instrument, Interest Rate, Stated Percentage | 5.45% |  | 5.45% |
Unsecured Senior Notes 6.25% Due February 2013 [Member] |  |  |  |
Debt Instrument |  |  |  |
Senior note carrying value | 62,692 | [2] | 62,677 | [2]
Debt Instrument, Interest Rate, Stated Percentage | 6.25% |  | 6.25% |
Unsecured Senior Notes 5.125% Due October 2013 [Member] |  |  |  |
Debt Instrument |  |  |  |
Senior note carrying value | 117,522 | [2] | 117,197 | [2]
Debt Instrument, Interest Rate, Stated Percentage | 5.125% |  | 5.125% |
Unsecured Senior Notes 5.25% Due January 2014 [Member] |  |  |  |
Debt Instrument |  |  |  |
Senior note carrying value | 255,887 | [2] | 255,882 | [2]
Debt Instrument, Interest Rate, Stated Percentage | 5.25% |  | 5.25% |
Unsecured Senior Notes 5.70% Due May 2014 [Member] |  |  |  |
Debt Instrument |  |  |  |
Senior note carrying value | 312,613 | [2] | 311,900 | [2]
Debt Instrument, Interest Rate, Stated Percentage | 5.70% |  | 5.70% |
Unsecured Senior Notes 5.20% Due February 2015 [Member] |  |  |  |
Debt Instrument |  |  |  |
Senior note carrying value | 207,916 | [2] | 207,906 | [2]
Debt Instrument, Interest Rate, Stated Percentage | 5.20% |  | 5.20% |
Unsecured Senior Notes 5.25% Due June 2015 [Member] |  |  |  |
Debt Instrument |  |  |  |
Senior note carrying value | 271,557 | [2] | 270,551 | [2]
Debt Instrument, Interest Rate, Stated Percentage | 5.25% |  | 5.25% |
Unsecured Senior Notes 6.50% Due May 2016 [Member] |  |  |  |
Debt Instrument |  |  |  |
Senior note carrying value | 469,774 | [2] | 469,147 | [2]
Debt Instrument, Interest Rate, Stated Percentage | 6.50% |  | 6.50% |
Unsecured Senior Notes 7.625% Due October 2017 [Member] |  |  |  |
Debt Instrument |  |  |  |
Senior note carrying value | 149,400 | [3] | 149,373 | [3]
Debt Instrument, Interest Rate, Stated Percentage | 7.625% |  | 7.625% |
Unsecured Senior Notes 7.875% Due June 2032 [Member] |  |  |  |
Debt Instrument |  |  |  |
Senior note carrying value | 299,119 | [2] | 299,108 | [2]
Debt Instrument, Interest Rate, Stated Percentage | 7.875% |  | 7.875% |
Unsecured Senior Notes 6.375% Due May 2033 [Member] |  |  |  |
Debt Instrument |  |  |  |
Senior note carrying value | 398,436 | [2] | 398,418 | [2]
Debt Instrument, Interest Rate, Stated Percentage | 6.375% |  | 6.375% |
Unsecured Senior Notes 6.00% Due February 2035 [Member] |  |  |  |
Debt Instrument |  |  |  |
Senior note carrying value | 299,396 | [2] | 299,390 | [2]
Debt Instrument, Interest Rate, Stated Percentage | 6.00% |  | 6.00% |
Unsecured Senior Notes 7.375% Due June 2046 [Member] |  |  |  |
Debt Instrument |  |  |  |
Senior note carrying value | $ 150,000 | [2] | $ 150,000 | [2]
Debt Instrument, Interest Rate, Stated Percentage | 7.375% |  | 7.375% |
[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] | Redeemable prior to maturity, guaranteed on a senior basis by certain wholly-owned subsidiaries
[3] | Not redeemable prior to maturity; guaranteed on a senior basis by certain wholly-owned subsidiaries

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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 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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