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Income Taxes (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current income tax expense:      
Federal $ 55,877 $ 49,736 $ 42,568
State 5,927 7,818 13,490
Foreign 30,543 37,480 30,056
Current income tax expense 92,347 95,034 86,114
Deferred income tax (benefit) expense:      
Federal (3,113) 216 972
State (347) 148 (215)
Foreign (1,500) (1,295) (1,410)
Deferred income tax (benefit) expense: (4,960) (931) (653)
Provision for income taxes $ 87,387 $ 94,103 $ 85,461