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Income Taxes - Rollforward of Valuation Allowance (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Roll forward of valuation allowance:      
Balance at Beginning of the Year $ 55,666    
Balance at the End of the Year 60,003 $ 55,666  
Valuation Allowance of Deferred Tax Assets      
Roll forward of valuation allowance:      
Balance at Beginning of the Year 55,666 61,756 $ 71,359
Charged (Credited) to Expense 6,211 3,568 (4,317)
Other Increases/(Decreases) (1,874) (9,658) (5,286)
Balance at the End of the Year $ 60,003 $ 55,666 $ 61,756