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Income Taxes - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Line Items]        
Statutory tax rate   35.00% 35.00% 35.00%
Tax benefit or expense recognized due to valuation allowance   $ 0    
Deferred tax assets and liabilities related to revaluation   34,800    
Uncertain tax positions, interest and penalties recognized   125 $ 31 $ 26
Luxemburg        
Income Taxes [Line Items]        
Net operating losses carryforward   $ 3,600    
Scenario Forecast        
Income Taxes [Line Items]        
Statutory tax rate 21.00%