Exit Activity Costs and Asset Impairments (Reconciles of Liability for Exit Activity Costs Relating to Facility Consolidation Efforts) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restructuring and Related Activities [Abstract]
Exit activity costs, net	$ 256	$ 3,919
Restructuring Reserve [Roll Forward]
Beginning balance	961	3,744
Cash payments	(739)	(4,617)
Ending balance	$ 478	$ 3,046