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Debt (Summary of Senior Notes) (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended |  |
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Sep. 30, 2013 Unsecured Senior Notes 5.25% due January 2014 [Member] | Dec. 31, 2012 Unsecured Senior Notes 5.25% due January 2014 [Member] | Sep. 30, 2013 Unsecured Senior Notes 5.70% due May 2014 [Member] | Dec. 31, 2012 Unsecured Senior Notes 5.70% due May 2014 [Member] | Sep. 30, 2013 Unsecured Senior Notes 5.20% due February 2015 [Member] | Dec. 31, 2012 Unsecured Senior Notes 5.20% due February 2015 [Member] | Sep. 30, 2013 Unsecured Senior Notes 5.25% due June 2015 [Member] | Dec. 31, 2012 Unsecured Senior Notes 5.25% due June 2015 [Member] | Sep. 30, 2013 Unsecured Senior Notes 6.50% due May 2016 [Member] | Dec. 31, 2012 Unsecured Senior Notes 6.50% due May 2016 [Member] | Sep. 30, 2013 Unsecured Senior Notes 7.625% due October 2017 [Member] | Dec. 31, 2012 Unsecured Senior Notes 7.625% due October 2017 [Member] | Sep. 30, 2013 Unsecured Senior Notes 7.875% due June 2032 [Member] | Dec. 31, 2012 Unsecured Senior Notes 7.875% due June 2032 [Member] | Sep. 30, 2013 Unsecured Senior Notes 6.375% due May 2033 [Member] | Dec. 31, 2012 Unsecured Senior Notes 6.375% due May 2033 [Member] | Sep. 30, 2013 Unsecured Senior Notes 6.00% due February 2035 [Member] | Dec. 31, 2012 Unsecured Senior Notes 6.00% due February 2035 [Member] | Sep. 30, 2013 Unsecured Senior Notes 7.375% due June 2046 [Member] | Dec. 31, 2012 Unsecured Senior Notes 7.375% due June 2046 [Member] | Sep. 30, 2013 Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior note carrying value | $ 2,056,657,000 | [1] |  | $ 2,056,657,000 | [1] |  | $ 2,509,613,000 | [1] | $ 0 | [2] | $ 187,970,000 | [2] | $ 0 | [2] | $ 208,274,000 | [2] | $ 95,627,000 | [2] | $ 95,615,000 | [2] | $ 232,243,000 | [2] | $ 264,058,000 | [2] | $ 458,975,000 | [2] | $ 457,154,000 | [2] | $ 122,641,000 | [3] | $ 149,481,000 | [3] | $ 299,185,000 | [2] | $ 299,152,000 | [2] | $ 398,550,000 | [2] | $ 398,492,000 | [2] | $ 299,436,000 | [2] | $ 299,417,000 | [2] | $ 150,000,000 | [2] | $ 150,000,000 | [2] |  |
Estimated fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,060,018,000 | 2,663,451,000
Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  | 5.25% |  | 5.25% |  | 5.70% |  | 5.70% |  | 5.20% |  | 5.20% |  | 5.25% |  | 5.25% |  | 6.50% |  | 6.50% |  | 7.625% |  | 7.625% |  | 7.875% |  | 7.875% |  | 6.375% |  | 6.375% |  | 6.00% |  | 6.00% |  | 7.375% |  | 7.375% |  |  |
Maturity Date, Description |  |  |  |  |  |  |  |  | January 2014 |  | January 2014 |  | May 2014 |  | May 2014 |  | February 2015 |  | February 2015 |  | June 2015 |  | June 2015 |  | May 2016 |  | May 2016 |  | October 2017 |  | October 2017 |  | June 2032 |  | June 2032 |  | May 2033 |  | May 2033 |  | February 2035 |  | February 2035 |  | June 2046 |  | June 2046 |  |  |
Extinguishment of Debt, Amount | $ 27,000,000 |  | $ 96,400,000 | $ 461,400,000 |  | $ 96,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[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 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 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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