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Exit Activity Costs and Asset Impairments (Schedule Of Asset Impairment Charges Related To Restructuring Activities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]      
Inventory write-downs &/or asset impairment charges $ 81 $ 408 $ 1,918
Exit activity costs 2,207 5,166 2,801
Total exit activity costs & asset impairments 2,288 5,574 4,719
Corporate      
Restructuring Cost and Reserve [Line Items]      
Inventory write-downs &/or asset impairment charges 0 0 0
Exit activity costs 375 1,660 438
Total exit activity costs & asset impairments 375 1,660 438
Renewable Energy & Conservation | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Inventory write-downs &/or asset impairment charges 72 (9) 105
Exit activity costs 875 66 (33)
Total exit activity costs & asset impairments 947 57 72
Residential Products | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Inventory write-downs &/or asset impairment charges 9 417 1,586
Exit activity costs 731 3,440 1,321
Total exit activity costs & asset impairments 740 3,857 2,907
Infrastructure Products | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Inventory write-downs &/or asset impairment charges 0 0 227
Exit activity costs 226 0 1,075
Total exit activity costs & asset impairments $ 226 $ 0 $ 1,302