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Debt (Summary Of Company's Senior Notes) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Debt Instrument    
Senior note carrying value $ 3,090,946 [1] $ 3,088,344 [1]
Unsecured Senior Notes 8.125% Due February 2011 [Member]
    
Debt Instrument    
Debt Instrument, Interest Rate, Stated Percentage 8.125% 8.125%
Unsecured Senior Notes 5.45% Due August 2012 [Member]
    
Debt Instrument    
Senior note carrying value 96,634 [2] 96,795 [2]
Debt Instrument, Interest Rate, Stated Percentage 5.45% 5.45%
Unsecured Senior Notes 6.25% Due February 2013 [Member]
    
Debt Instrument    
Senior note carrying value 62,692 [2] 62,677 [2]
Debt Instrument, Interest Rate, Stated Percentage 6.25% 6.25%
Unsecured Senior Notes 5.125% Due October 2013 [Member]
    
Debt Instrument    
Senior note carrying value 117,522 [2] 117,197 [2]
Debt Instrument, Interest Rate, Stated Percentage 5.125% 5.125%
Unsecured Senior Notes 5.25% Due January 2014 [Member]
    
Debt Instrument    
Senior note carrying value 255,887 [2] 255,882 [2]
Debt Instrument, Interest Rate, Stated Percentage 5.25% 5.25%
Unsecured Senior Notes 5.70% Due May 2014 [Member]
    
Debt Instrument    
Senior note carrying value 312,613 [2] 311,900 [2]
Debt Instrument, Interest Rate, Stated Percentage 5.70% 5.70%
Unsecured Senior Notes 5.20% Due February 2015 [Member]
    
Debt Instrument    
Senior note carrying value 207,916 [2] 207,906 [2]
Debt Instrument, Interest Rate, Stated Percentage 5.20% 5.20%
Unsecured Senior Notes 5.25% Due June 2015 [Member]
    
Debt Instrument    
Senior note carrying value 271,557 [2] 270,551 [2]
Debt Instrument, Interest Rate, Stated Percentage 5.25% 5.25%
Unsecured Senior Notes 6.50% Due May 2016 [Member]
    
Debt Instrument    
Senior note carrying value 469,774 [2] 469,147 [2]
Debt Instrument, Interest Rate, Stated Percentage 6.50% 6.50%
Unsecured Senior Notes 7.625% Due October 2017 [Member]
    
Debt Instrument    
Senior note carrying value 149,400 [3] 149,373 [3]
Debt Instrument, Interest Rate, Stated Percentage 7.625% 7.625%
Unsecured Senior Notes 7.875% Due June 2032 [Member]
    
Debt Instrument    
Senior note carrying value 299,119 [2] 299,108 [2]
Debt Instrument, Interest Rate, Stated Percentage 7.875% 7.875%
Unsecured Senior Notes 6.375% Due May 2033 [Member]
    
Debt Instrument    
Senior note carrying value 398,436 [2] 398,418 [2]
Debt Instrument, Interest Rate, Stated Percentage 6.375% 6.375%
Unsecured Senior Notes 6.00% Due February 2035 [Member]
    
Debt Instrument    
Senior note carrying value 299,396 [2] 299,390 [2]
Debt Instrument, Interest Rate, Stated Percentage 6.00% 6.00%
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%
[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