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Income Taxes - Tax Reform (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Tax reform          
Statutory tax rate     35.00% 34.00% 34.00%
Undistributed earnings and profits subject to repatriation tax   $ 187 $ 187    
Income tax expense on foreign earnings deemed repatriated     18,246    
Tax liability for repatriation tax   $ 14,436 14,436    
Repatriation tax, period for payment   8 years      
Deferred tax expense for foreign taxes on distributions from foreign subsidiaries deemed repatriated   $ 7,281      
Provisional tax expense for remeasurement of net deferred tax assets     $ 2,339    
Forecast          
Tax reform          
Statutory tax rate 21.00%