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Income Taxes - Rollforward of Valuation Allowance (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Tax carryforwards      
Net operating loss carryforwards $ 92,952 $ 105,026  
Roll forward of valuation allowance:      
Balance at Beginning of the Year 61,756    
Balance at the End of the Year 55,666 61,756  
Valuation Allowance of Deferred Tax Assets      
Roll forward of valuation allowance:      
Balance at Beginning of the Year 61,756 71,359 $ 60,009
Charged (Credited) to Expense 3,568 (4,317) 7,660
Currency Translation Adjustments (9,658) (5,286) 3,690
Balance at the End of the Year $ 55,666 $ 61,756 $ 71,359