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Income Taxes - Tax Reform (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Tax reform        
Statutory tax rate   21.00% 35.00% 34.00%
Percentage of tax reform enacted   15.50%    
Percentage of tax reform enacted remaining earnings   8.00%    
Income tax expense on foreign earnings deemed repatriated     $ 18,200  
Tax liability for repatriation tax $ 10,600   $ 10,600  
Repatriation tax, period for payment     8 years  
Long-term income taxes payable 12,848 $ 7,620 $ 12,848  
Deferred tax expense for foreign taxes on distributions from foreign subsidiaries deemed repatriated $ 7,300 0    
Provisional tax expense for remeasurement of net deferred tax assets     $ 2,300  
Maximum        
Tax reform        
Incremental tax expense relating foreign subsidiary earnings in excess of an allowable return on the foreign subsidiary’s tangible assets   100    
Forecast        
Tax reform        
Reduction of provisional taxes payable   500    
Adjustment        
Tax reform        
Long-term income taxes payable   $ 2,500