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Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
US and foreign income (loss) before income taxes      
United States $ 49,021,000 $ 56,836,000 $ (2,886,000)
Foreign 190,574,000 181,367,000 180,416,000
Income before income taxes 239,595,000 238,203,000 177,530,000
Current:      
U.S. federal statutory tax 6,858,000 7,685,000 12,245,000
State 938,000 2,767,000 1,358,000
Foreign 24,649,000 27,514,000 22,367,000
Total current income tax provision (benefit) 32,445,000 37,966,000 35,970,000
Deferred:      
U.S. federal statutory tax 7,642,000 6,218,000 (3,776,000)
State 1,380,000 2,194,000 (1,926,000)
Foreign 643,000 (6,771,000) (1,677,000)
Total deferred income (loss) before income taxes 9,665,000 1,641,000 (7,379,000)
Non-current tax (income) expense (3,866,000) (606,000) 2,436,000
Income tax provision 38,244,000 39,001,000 31,027,000
Reconciliation of U.S. federal statutory income 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) (16.70%) (18.70%) (18.60%)
State income taxes, net of U.S. federal income tax benefit (as a percent) 0.60% 1.30% 0.10%
Other permanent differences (as a percent) (2.90%) (1.20%) 1.00%
Effective income tax rate (as a percent) 16.00% 16.40% 17.50%
Earnings attributable to foreign subsidiaries $ 934,500,000 $ 794,000,000