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Restructuring Costs - Severance Obligation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning balance     $ 1,000 $ 0
Charges for employee severance, benefits and other $ 50 $ 1,069 203 3,722
Payments     (515) 0
Foreign currency impact     (55) 200
Restructuring reserve, ending balance $ 633 $ 3,922 $ 633 $ 3,922