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Debt (Summary Of Company's Senior Notes) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument    
Senior note carrying value $ 2,509,613 [1] $ 3,088,344 [1]
Estimated fair value 2,663,451 2,765,151
Unsecured Senior Notes 5.45% Due August 2012 [Member]
   
Debt Instrument    
Senior note carrying value 0 [2] 96,795 [2]
Debt Instrument, Interest Rate, Stated Percentage 5.45% 5.45%
Debt Instrument, Maturity Date, Description August 2012 August 2012
Unsecured Senior Notes 6.25% Due February 2013 [Member]
   
Debt Instrument    
Senior note carrying value 0 [2] 62,677 [2]
Debt Instrument, Interest Rate, Stated Percentage 6.25% 6.25%
Debt Instrument, Maturity Date, Description February 2013 February 2013
Unsecured Senior Notes 5.125% Due October 2013 [Member]
   
Debt Instrument    
Senior note carrying value 0 [2] 117,197 [2]
Debt Instrument, Interest Rate, Stated Percentage 5.125% 5.125%
Debt Instrument, Maturity Date, Description October 2013 October 2013
Unsecured Senior Notes 5.25% Due January 2014 [Member]
   
Debt Instrument    
Senior note carrying value 187,970 [2] 255,882 [2]
Debt Instrument, Interest Rate, Stated Percentage 5.25% 5.25%
Debt Instrument, Maturity Date, Description January 2014 January 2014
Unsecured Senior Notes 5.70% Due May 2014 [Member]
   
Debt Instrument    
Senior note carrying value 208,274 [2] 311,900 [2]
Debt Instrument, Interest Rate, Stated Percentage 5.70% 5.70%
Debt Instrument, Maturity Date, Description May 2014 May 2014
Unsecured Senior Notes 5.20% Due February 2015 [Member]
   
Debt Instrument    
Senior note carrying value 95,615 [2] 207,906 [2]
Debt Instrument, Interest Rate, Stated Percentage 5.20% 5.20%
Debt Instrument, Maturity Date, Description February 2015 February 2015
Unsecured Senior Notes 5.25% Due June 2015 [Member]
   
Debt Instrument    
Senior note carrying value 264,058 [2] 270,551 [2]
Debt Instrument, Interest Rate, Stated Percentage 5.25% 5.25%
Debt Instrument, Maturity Date, Description June 2015 June 2015
Unsecured Senior Notes 6.50% Due May 2016 [Member]
   
Debt Instrument    
Senior note carrying value 457,154 [2] 469,147 [2]
Debt Instrument, Interest Rate, Stated Percentage 6.50% 6.50%
Debt Instrument, Maturity Date, Description May 2016 May 2016
Unsecured Senior Notes 7.625% Due October 2017 [Member]
   
Debt Instrument    
Senior note carrying value 149,481 [3] 149,373 [3]
Debt Instrument, Interest Rate, Stated Percentage 7.625% 7.625%
Debt Instrument, Maturity Date, Description October 2017 October 2017
Unsecured Senior Notes 7.875% Due June 2032 [Member]
   
Debt Instrument    
Senior note carrying value 299,152 [2] 299,108 [2]
Debt Instrument, Interest Rate, Stated Percentage 7.875% 7.875%
Debt Instrument, Maturity Date, Description June 2032 June 2032
Unsecured Senior Notes 6.375% Due May 2033 [Member]
   
Debt Instrument    
Senior note carrying value 398,492 [2] 398,418 [2]
Debt Instrument, Interest Rate, Stated Percentage 6.375% 6.375%
Debt Instrument, Maturity Date, Description May 2033 May 2033
Unsecured Senior Notes 6.00% Due February 2035 [Member]
   
Debt Instrument    
Senior note carrying value 299,417 [2] 299,390 [2]
Debt Instrument, Interest Rate, Stated Percentage 6.00% 6.00%
Debt Instrument, Maturity Date, Description February 2035 February 2035
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%
Debt Instrument, Maturity Date, Description 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] 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.