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Debt (Summary Of Company's Senior Notes) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Debt Instrument    
Senior note carrying value $ 3,088,344 $ 3,391,668
Estimated fair value 2,765,151 3,227,404
Unsecured Senior Notes 8.125% Due February 2011 [Member]
   
Debt Instrument    
Senior note carrying value 0 [1] 13,900 [1]
Debt Instrument, Interest Rate, Stated Percentage 8.125% 8.125%
Debt Instrument, Maturity Date, Description February 2011 February 2011
Unsecured Senior Notes 5.45% Due August 2012 [Member]
   
Debt Instrument    
Senior note carrying value 96,795 [2] 104,823 [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 62,677 [2] 62,617 [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 117,197 [2] 160,212 [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 255,882 [2] 335,848 [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 311,900 [2] 309,048 [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 207,906 [2] 244,839 [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 270,551 [2] 397,700 [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 469,147 [2] 466,644 [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 149,373 [1] 149,265 [1]
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 299,108 [2] 299,065 [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 398,418 [2] 398,344 [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 299,390 [2] 299,363 [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] (a)Not redeemable prior to maturity, guaranteed on a senior basis by certain wholly-owned subsidiaries
[2] Redeemable prior to maturity, guaranteed on a senior basis by certain wholly-owned subsidiaries