Exit Activity Costs and Asset Impairments (Schedule Of Asset Impairment Charges Related To Restructuring Activities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment charges	$ 7,530	$ 8,504	$ 208
Exit activity costs	6,217	1,418	2,126
Gain on sale leaseback		(6,799)	(663)
Total exit activity costs & asset impairments	13,747	3,123	1,671
Corporate
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment charges	0	0	0
Exit activity costs	58	0	0
Gain on sale leaseback		0	0
Total exit activity costs & asset impairments	58	0	0
Residential Products | Operating Segments
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment charges	1,459	6,495	83
Exit activity costs	1,074	1,256	1,332
Gain on sale leaseback		(6,799)	(663)
Total exit activity costs & asset impairments	2,533	952	752
Industrial and Infrastructure Products | Operating Segments
Restructuring Cost and Reserve [Line Items]
Inventory write-downs &/or asset impairment charges	4,221	2,009	125
Exit activity costs	4,546	162	794
Gain on sale leaseback		0	0
Total exit activity costs & asset impairments	$ 8,767	$ 2,171	$ 919