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Debt (Summary of Senior Notes) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Debt Instrument [Line Items] |  |  |  |
Senior note carrying value | $ 2,511,729 | [1] | $ 2,509,613 | [1]
Unsecured Senior Notes 5.25% due January 2014 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior note carrying value | 187,973 | [2] | 187,970 | [2]
Interest Rate, Stated Percentage | 5.25% |  | 5.25% |
Maturity Date, Description | January 2014 |  | January 2014 |
Unsecured Senior Notes 5.70% due May 2014 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior note carrying value | 208,745 | [2] | 208,274 | [2]
Interest Rate, Stated Percentage | 5.70% |  | 5.70% |
Maturity Date, Description | May 2014 |  | May 2014 |
Unsecured Senior Notes 5.20% due February 2015 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior note carrying value | 95,620 | [2] | 95,615 | [2]
Interest Rate, Stated Percentage | 5.20% |  | 5.20% |
Maturity Date, Description | February 2015 |  | February 2015 |
Unsecured Senior Notes 5.25% due June 2015 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior note carrying value | 265,025 | [2] | 264,058 | [2]
Interest Rate, Stated Percentage | 5.25% |  | 5.25% |
Maturity Date, Description | June 2015 |  | June 2015 |
Unsecured Senior Notes 6.50% due May 2016 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior note carrying value | 457,761 | [2] | 457,154 | [2]
Interest Rate, Stated Percentage | 6.50% |  | 6.50% |
Maturity Date, Description | May 2016 |  | May 2016 |
Unsecured Senior Notes 7.625% due October 2017 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior note carrying value | 149,508 | [3] | 149,481 | [3]
Interest Rate, Stated Percentage | 7.625% |  | 7.625% |
Maturity Date, Description | October 2017 |  | October 2017 |
Unsecured Senior Notes 7.875% due June 2032 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior note carrying value | 299,163 | [2] | 299,152 | [2]
Interest Rate, Stated Percentage | 7.875% |  | 7.875% |
Maturity Date, Description | June 2032 |  | June 2032 |
Unsecured Senior Notes 6.375% due May 2033 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior note carrying value | 398,511 | [2] | 398,492 | [2]
Interest Rate, Stated Percentage | 6.375% |  | 6.375% |
Maturity Date, Description | May 2033 |  | May 2033 |
Unsecured Senior Notes 6.00% due February 2035 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior note carrying value | 299,423 | [2] | 299,417 | [2]
Interest Rate, Stated Percentage | 6.00% |  | 6.00% |
Maturity Date, Description | February 2035 |  | February 2035 |
Unsecured Senior Notes 7.375% due June 2046 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior note carrying value | 150,000 | [2] | 150,000 | [2]
Interest Rate, Stated Percentage | 7.375% |  | 7.375% |
Maturity Date, Description | June 2046 |  | June 2046 |
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Estimated fair value | $ 2,675,497 |  | $ 2,663,451 |
[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 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 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)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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. + 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 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 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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