Exit Activity Costs and Asset Impairments (Reconciles Of Liability For Exit Activity Costs Relating To Facility Consolidation Efforts) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Reserve [Roll Forward]
Balance as of	$ 3,744	$ 603
Exit activity costs recognized	7,125	6,217	$ 1,418
Cash payments	(9,908)	(3,076)
Balance as of	$ 961	$ 3,744	$ 603