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Costs Associated with Exit and Restructuring Activities - Restructuring Reserve Activity (Details) - June 2013 Plan, April 2014 Plan and June 2016 Plan
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Restructuring reserve activity  
Restructuring liability at beginning $ 1,913
Restructuring and restructuring-related charges 2,367
Cost paid (2,603)
Restructuring liability at ending 1,656
Restructuring Reserve, Translation and Other Adjustment $ (21)