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Income Tax Income Tax (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Income Tax [Abstract]          
Increase (Decrease) in Deferred Income Taxes     $ (830) $ 0  
Income Tax Expense (Benefit) $ (1,531) $ 479 $ 436 $ 802  
Effective income tax rate     10.80%    
Undistributed Earnings of Foreign Subsidiaries         $ 8,400
Effective Income Tax Rate Reconciliation, Percent     33.50%