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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Taxes [Abstract]      
Current tax, U.S. Federal $ 165,731 $ 166,386 $ 100,983
Current tax, U.S. State 39,136 31,231 21,848
Current tax, Foreign 63 125 (6)
Current tax, Total 204,930 197,742 122,825
Deferred tax, U.S. Federal 5,238 (16,024) 12,080
Deferred tax, U.S. State (3,105) (2,013) (50)
Deferred tax, Foreign (1,330) (1,578) (711)
Deferred tax, Total 803 (19,615) 11,319
Valuation allowance 1,300 1,558 616
Total provision for income taxes $ 207,033 $ 179,685 $ 134,760