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Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
U.S. and foreign income before income taxes      
United States $ 31,823,000 $ 49,021,000 $ 56,836,000
Foreign 214,842,000 190,574,000 181,367,000
Income before income taxes 246,665,000 239,595,000 238,203,000
Current:      
U.S. federal statutory tax 8,167,000 6,858,000 7,685,000
State 1,822,000 938,000 2,767,000
Foreign 36,254,000 24,649,000 27,514,000
Total current income tax provision (benefit) 46,243,000 32,445,000 37,966,000
Deferred:      
U.S. federal statutory tax 2,171,000 7,642,000 6,218,000
State 566,000 1,380,000 2,194,000
Foreign (10,980,000) 643,000 (6,771,000)
Total deferred income (loss) before income taxes (8,243,000) 9,665,000 1,641,000
Non-current tax expense (income) 1,505,000 (3,866,000) (606,000)
Income tax provision 39,505,000 38,244,000 39,001,000
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) (18.70%) (16.70%) (18.70%)
State income taxes, net of U.S. federal income tax benefit (as a percent) 0.60% 0.60% 1.30%
Other permanent differences (as a percent) (0.90%) (2.90%) (1.20%)
Effective income tax rate (as a percent) 16.00% 16.00% 16.40%
Earnings attributable to foreign subsidiaries 1,100,000,000 934,500,000  
Amount of income tax liability accrued $ 0 $ 0