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Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
US and foreign income (loss) before income taxes      
United States $ 56,836,000 $ (2,886,000) $ 3,916,000
Foreign 181,367,000 180,416,000 145,993,000
Income before income taxes 238,203,000 177,530,000 149,909,000
Current:      
U.S. federal statutory tax 7,685,000 12,245,000  
State 2,767,000 1,358,000 (242,000)
Foreign 27,514,000 22,367,000 20,897,000
Total current income tax provision (benefit) 37,966,000 35,970,000 20,655,000
Deferred:      
U.S. federal statutory tax 6,218,000 (3,776,000) 5,126,000
State 2,194,000 (1,926,000) 625,000
Foreign (6,771,000) (1,677,000) 2,168,000
Total deferred income (loss) before income taxes 1,641,000 (7,379,000) 7,919,000
Non-current tax (income) expense (606,000) 2,436,000 3,772,000
Total 39,001,000 31,027,000 32,346,000
Reconciliation of U.S. federal statutory tax rate to effective income tax rate      
U.S. federal statutory tax rate (as a percent) 35.00% 35.00% 35.00%
Foreign earnings, net of foreign taxes (as a percent) (18.70%) (18.60%) (16.90%)
State income taxes, net of U.S. federal income tax benefit (as a percent) 1.30% 0.10%  
Other permanent differences (as a percent) (1.20%) 1.00% 3.50%
Effective income tax rate (as a percent) 16.40% 17.50% 21.60%
Earnings attributable to foreign subsidiaries $ 794,000,000 $ 574,400,000