Exit Activity Costs and Asset Impairments (Summary of Exit Activity Costs and Asset Impairments by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment recoveries	$ (917)	$ 910
Exit activity costs	3,919	788
Net asset impairment and exit activity charges (gains)	3,002	1,698
Residential Products
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment recoveries	(21)	688
Exit activity costs	185	330
Net asset impairment and exit activity charges (gains)	164	1,018
Industrial and Infrastructure Products
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment recoveries	(896)	222
Exit activity costs	2,656	458
Net asset impairment and exit activity charges (gains)	1,760	680
Renewable Energy & Conservation
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment recoveries	0	0
Exit activity costs	1,050	0
Net asset impairment and exit activity charges (gains)	1,050	0
Corporate
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment recoveries	0	0
Exit activity costs	28	0
Net asset impairment and exit activity charges (gains)	$ 28	$ 0