Goodwill and Related Intangible Assets (Schedule of Changes in Carrying Amount of Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Roll Forward]
Balance at	$ 236,044	$ 341,174
Acquired goodwill	57,180
Impairment		(104,565)	$ (104,565)
Foreign currency translation	(834)	(565)
Balance at	292,390	236,044	341,174
Residential Products
Goodwill [Roll Forward]
Balance at	181,285	195,520
Acquired goodwill	0
Impairment		(14,235)
Foreign currency translation	0	0
Balance at	181,285	181,285	195,520
Industrial and Infrastructure Products
Goodwill [Roll Forward]
Balance at	54,759	145,654
Acquired goodwill	0
Impairment		(90,330)
Foreign currency translation	(1,055)	(565)
Balance at	53,704	54,759	145,654
Renewable Energy and Conservation
Goodwill [Roll Forward]
Balance at	0	0
Acquired goodwill	57,180
Impairment		0
Foreign currency translation	221	0
Balance at	$ 57,401	$ 0	$ 0