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Income Taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Differences between the provision for income taxes at the U.S. federal statutory rate and the tax      
U.S. federal statutory tax rate 35.00% 35.00% 35.00%
Federal tax at statutory rate $ 15,689 $ 16,098 $ 10,564
State and local taxes, net of federal benefit 485 590 432
U.S. federal permanent items 332 14 324
Domestic productions activity deduction (669) (401) (312)
Foreign earnings and related tax credits 1,498 261 641
Non-U.S. tax rate variances (1,175) (1,510) (3,121)
Unrecognized tax benefits 310 21 (368)
Valuation allowance (337) 19 (403)
Tax credits (85) (265) (329)
Other, net (507) 183 (253)
Income taxes $ 15,541 $ 15,010 $ 7,175