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Income Taxes - Other Income Tax Disclosures (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Uncertain tax positions      
Tax reserves related to current year uncertain tax positions $ 0    
Accrued interest related to current year uncertain tax positions 0    
Tax reserves related to prior year uncertain tax positions 3,700    
Accrued interest related to prior year uncertain tax positions (4,200)    
Previously recorded tax reserves for uncertain tax positions that have settled and/or closed (4,900)    
Net tax expense in connection with uncertain tax positions 9,000    
Unrecognized tax benefits 26,792 $ 2,198 $ 7,036
Tax positions that, if reversed, would affect the effective tax rate 9,400 10,000  
Currency translation gains 1,700 3,000  
Interest and penalties recognized, net of deferred taxes 300 1,400  
Reductions in previously accrued interest and penalties 3,500    
Prepaid Taxes 30,100 $ 48,900  
Income taxes receivable $ 26,900