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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current:      
Federal $ 83,905 $ 54,132 $ 25,046
State 13,949 8,948 1,792
Foreign 659 544 846
Total current 98,513 63,624 27,684
Deferred      
Federal 37,259 11,228 (1,614)
State (415) (2,428) 1,881
Foreign 182 641 (1,289)
Total deferred 37,026 9,441 (1,022)
Other non-current      
Federal 573 7,605 15,672
State 114 1,621 1,068
Foreign 3 (417) 543
Total other 690 8,809 17,283
Total income tax expense $ 136,229 $ 81,874 $ 43,945