Costs Associated with Exit and Restructuring Activities - Restructuring Reserve Activity (Details) - June 2013 Plan, April 2014 Plan and June 2016 Plan $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Restructuring reserve activity
Restructuring liability at beginning	$ 2,162
Restructuring and restructuring-related charges	2,942
Cost paid	(3,162)
Restructuring liability at ending	2,007
Restructuring Reserve, Translation and Other Adjustment	$ 65