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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |
Inventory write-downs &/or asset impairment charges | $ 1,750 | $ 806 | $ 1,088 | $ (1,931)
Exit activity costs (recoveries), net | 1,910 | 761 | 2,264 | 6,706
Total exit activity costs & asset impairments | 3,660 | 1,567 | 3,352 | 4,775
Residential Products |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Inventory write-downs &/or asset impairment charges | 1,392 | 442 | 1,349 | 295
Exit activity costs (recoveries), net | 485 | 566 | 333 | 958
Total exit activity costs & asset impairments | 1,877 | 1,008 | 1,682 | 1,253
Industrial and Infrastructure Products |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Inventory write-downs &/or asset impairment charges | 358 | 98 | (345) | (2,492)
Exit activity costs (recoveries), net | 1,417 | (12) | 1,607 | 2,959
Total exit activity costs & asset impairments | 1,775 | 86 | 1,262 | 467
Renewable Energy & Conservation |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Inventory write-downs &/or asset impairment charges | 0 | 266 | 84 | 266
Exit activity costs (recoveries), net | (156) | 191 | (107) | 2,610
Total exit activity costs & asset impairments | (156) | 457 | (23) | 2,876
Corporate |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Inventory write-downs &/or asset impairment charges | 0 | 0 | 0 | 0
Exit activity costs (recoveries), net | 164 | 16 | 431 | 179
Total exit activity costs & asset impairments | $ 164 | $ 16 | $ 431 | $ 179

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