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Provision for Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Disclosure [Abstract]      
Income from continuing operations before income taxes $ 122,611 $ 107,681 $ 79,932
Federal 17,554 16,698 13,470
Foreign 19,748 17,304 12,606
State and local 962 749 710
Total current income taxes 38,264 34,751 26,786
Deferred income taxes 3,242 2,407 1,844
Provision for income taxes $ 41,506 $ 37,158 $ 28,630