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Debt (Summary of Senior Notes) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Jun. 30, 2013
Unsecured Senior Notes 5.25% due January 2014 [Member]
Dec. 31, 2012
Unsecured Senior Notes 5.25% due January 2014 [Member]
Jun. 30, 2013
Unsecured Senior Notes 5.70% due May 2014 [Member]
Dec. 31, 2012
Unsecured Senior Notes 5.70% due May 2014 [Member]
Jun. 30, 2013
Unsecured Senior Notes 5.20% due February 2015 [Member]
Dec. 31, 2012
Unsecured Senior Notes 5.20% due February 2015 [Member]
Jun. 30, 2013
Unsecured Senior Notes 5.25% due June 2015 [Member]
Dec. 31, 2012
Unsecured Senior Notes 5.25% due June 2015 [Member]
Jun. 30, 2013
Unsecured Senior Notes 6.50% due May 2016 [Member]
Dec. 31, 2012
Unsecured Senior Notes 6.50% due May 2016 [Member]
Jun. 30, 2013
Unsecured Senior Notes 7.625% due October 2017 [Member]
Dec. 31, 2012
Unsecured Senior Notes 7.625% due October 2017 [Member]
Jun. 30, 2013
Unsecured Senior Notes 7.875% due June 2032 [Member]
Dec. 31, 2012
Unsecured Senior Notes 7.875% due June 2032 [Member]
Jun. 30, 2013
Unsecured Senior Notes 6.375% due May 2033 [Member]
Dec. 31, 2012
Unsecured Senior Notes 6.375% due May 2033 [Member]
Jun. 30, 2013
Unsecured Senior Notes 6.00% due February 2035 [Member]
Dec. 31, 2012
Unsecured Senior Notes 6.00% due February 2035 [Member]
Jun. 30, 2013
Unsecured Senior Notes 7.375% due June 2046 [Member]
Dec. 31, 2012
Unsecured Senior Notes 7.375% due June 2046 [Member]
Jun. 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 $ 2,082,062 [1]   $ 2,082,062 [1]   $ 2,509,613 [1] $ 0 [2] $ 187,970 [2] $ 0 [2] $ 208,274 [2] $ 95,624 [2] $ 95,615 [2] $ 231,402 [2] $ 264,058 [2] $ 458,369 [2] $ 457,154 [2] $ 149,535 [3] $ 149,481 [3] $ 299,174 [2] $ 299,152 [2] $ 398,529 [2] $ 398,492 [2] $ 299,429 [2] $ 299,417 [2] $ 150,000 [2] $ 150,000 [2]    
Estimated fair value                                                   2,159,514 2,663,451
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 $ 434,400 $ 0 $ 434,400 $ 0                                              
[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.