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Exit Activity Costs and Asset Impairments (Summary of Exit Activity Costs and Asset Impairments by Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Restructuring Cost and Reserve [Line Items] |  |  |  |
Inventory write-downs &/or asset impairment charges | $ 346 | $ 0 | $ 346 | $ 0
Exit activity costs | 664 | 2,136 | 955 | 2,355
Total | 1,010 | 2,136 | 1,301 | 2,355
Renewable Energy and Conservation |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Inventory write-downs &/or asset impairment charges | 72 | 0 | 72 | 0
Exit activity costs | 316 | (95) | 334 | (1)
Total | 388 | (95) | 406 | (1)
Residential Products |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Inventory write-downs &/or asset impairment charges | 0 | 0 | 0 | 0
Exit activity costs | 263 | 219 | 484 | 370
Total | 263 | 219 | 484 | 370
Industrial and Infrastructure Products |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Inventory write-downs &/or asset impairment charges | 274 | 0 | 274 | 0
Exit activity costs | 40 | 1,346 | 38 | 1,313
Total | 314 | 1,346 | 312 | 1,313
Corporate |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Inventory write-downs &/or asset impairment charges | 0 | 0 | 0 | 0
Exit activity costs | 45 | 666 | 99 | 673
Total | $ 45 | $ 666 | $ 99 | $ 673

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