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Income Taxes (Schedule Of Components Of Provision For Income Taxes) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Taxes [Abstract]      
Current tax, U.S. Federal $ 166,386 $ 100,983 $ 83,850
Current tax, U.S. State 31,231 21,848 15,745
Current tax, Foreign 125 (6) 6
Current tax, Total 197,742 122,825 99,601
Deferred tax, U.S. Federal (16,024) 12,080 10,058
Deferred tax, U.S. State (2,013) (50) 6
Deferred tax, Foreign (1,578) (711)  
Deferred tax, Total (19,615) 11,319 10,064
Valuation allowance 1,558 616 415
Total provision for income taxes $ 179,685 $ 134,760 $ 110,080