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Income Taxes (Components Of Income Tax Expense (Benefit)) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes [Abstract]      
Federal, Current $ 164,125 $ 136,247 $ 93,469
State, Current 28,669 22,914 13,733
Foreign, Current 8,683 4,448 1,210
Current Income Tax Expense (Benefit), Total 201,477 163,609 108,412
Federal, Deferred 17,343 (936) 4,855
State, Deferred (244) (492) 698
Foreign, Deferred (1,424) 3,103 (832)
Deferred Income Tax Expense (Benefit), Total 15,675 1,675 4,721
Federal, Total 181,468 135,311 98,324
State, Total 28,425 22,422 14,431
Foreign, Total 7,259 7,551 378
Total income tax expense $ 217,152 $ 165,284 $ 113,133