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Exit Activity Costs and Asset Impairments (Summary Of Exit Activity Costs And Asset Impairments by Segment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]      
Inventory write-downs &/or asset impairment charges (recoveries), net $ 1,344 $ (1,630) $ 7,530
Exit activity costs (recoveries), net 3,475 7,125 6,217
Total exit activity costs & asset impairments 4,819 5,495 13,747
Corporate      
Restructuring Cost and Reserve [Line Items]      
Inventory write-downs &/or asset impairment charges (recoveries), net 0 0 0
Exit activity costs (recoveries), net 438 261 58
Total exit activity costs & asset impairments 438 261 58
Residential Products | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Inventory write-downs &/or asset impairment charges (recoveries), net 1,586 345 1,459
Exit activity costs (recoveries), net 1,321 1,058 1,074
Total exit activity costs & asset impairments 2,907 1,403 2,533
Industrial and Infrastructure Products | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Inventory write-downs &/or asset impairment charges (recoveries), net (347) (2,484) 4,221
Exit activity costs (recoveries), net 1,749 2,820 4,546
Total exit activity costs & asset impairments 1,402 336 8,767
Renewable Energy & Conservation | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Inventory write-downs &/or asset impairment charges (recoveries), net 105 509 1,850
Exit activity costs (recoveries), net (33) 2,986 539
Total exit activity costs & asset impairments $ 72 $ 3,495 $ 2,389