Exit Activity Costs and Asset Impairments (Summary Of Exit Activity Costs And Asset Impairments Recorded in the Consolidated Statements of Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Total exit activity costs & asset impairments	$ 10,552	$ 4,819	$ 5,495
Cost of sales
Restructuring Cost and Reserve [Line Items]
Total exit activity costs & asset impairments	4,255	1,906	911
Selling, general, and administrative expense
Restructuring Cost and Reserve [Line Items]
Total exit activity costs & asset impairments	$ 6,297	$ 2,913	$ 4,584