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Income Taxes (Schedule Of Components Of The Provision (Benefit) For Income Taxes) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes [Abstract]      
Current, Federal $ 65,461 $ 70,715 $ 62,547
Current, State 10,084 10,236 10,730
Current, Foreign 638 860 286
Total current provision 76,183 81,811 73,563
Deferred, Federal 27,212 19,890 24,913
Deferred, State 3,131 2,645 2,984
Total deferred provision 30,343 22,535 27,897
Total tax provision $ 106,526 $ 104,346 $ 101,460