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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]      
Total exit activity costs & asset impairments $ 4,819 $ 5,495 $ 13,747
Cost of sales      
Restructuring Cost and Reserve [Line Items]      
Total exit activity costs & asset impairments 1,906 911 9,922
Selling, general, and administrative expense      
Restructuring Cost and Reserve [Line Items]      
Total exit activity costs & asset impairments $ 2,913 $ 4,584 $ 3,825