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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Reconciliation of income tax expense:        
Computed income tax expense at statutory federal income tax rate of 35%     $ 14,055 $ 8,821
State income taxes, net of federal provision     622 537
Foreign tax rate differentials     (2,194) (1,733)
U.S. tax on foreign earnings     1,681 1,452
Tax resolutions, net       (103)
Change in valuation allowance     48  
Proceeds from life insurance     (373)  
Other, net     (755) 37
Income tax expense $ 10,304 $ 523 $ 13,084 $ 9,011
Computed income tax expense at statutory federal income tax rate of 35%, tax rate     35.00% 35.00%
State income taxes, net of federal provision, tax rate     1.50% 2.10%
Foreign tax differentials rate     (5.50%) (6.90%)
U.S. tax on foreign earnings rate     4.30% 5.90%
Tax resolutions, net tax rate     0.00% (0.40%)
Change in valuation allowance, tax rate     0.10% 0.00%
Proceeds from life insurance rate     (0.90%) 0.00%
Other, net, tax rate     (1.90%) 0.10%
Income tax expense, tax rate     32.60% 35.80%