Costs Associated with Exit and Restructuring Activities - Restructuring Reserve Activity (Details) - April 2014 Plan and June 2016 Plan [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Restructuring reserve activity
Restructuring liability at beginning	$ 1,586
Restructuring and restructuring-related charges	2,084
Cost paid	(1,306)
Restructuring liability at ending	1,220
Restructuring Reserve, Translation and Other Adjustment	$ (1,144)