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Goodwill and Related Intangible Assets (Schedule of Changes in Carrying Amount of Goodwill) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Roll Forward]    
Balance at $ 321,074,000 $ 304,032,000
Acquired goodwill 3,051,000 16,790,000
Adjustments to prior year acquisitions 38,000 832,000
Adjustments to prior year acquisitions 0  
Foreign currency translation (416,000) 1,084,000
Balance at 323,671,000 321,074,000
Residential Products    
Goodwill [Roll Forward]    
Balance at 198,075,000 181,285,000
Acquired goodwill 0 16,790,000
Adjustments to prior year acquisitions 0 0
Foreign currency translation 0 0
Balance at 198,075,000 198,075,000
Industrial and Infrastructure Products    
Goodwill [Roll Forward]    
Balance at 54,280,000 53,884,000
Acquired goodwill 0 0
Adjustments to prior year acquisitions 38,000 0
Foreign currency translation (473,000) 396,000
Balance at 53,769,000 54,280,000
Renewable Energy & Conservation    
Goodwill [Roll Forward]    
Balance at 68,719,000 68,863,000
Acquired goodwill 3,051,000 0
Adjustments to prior year acquisitions 0 832,000
Foreign currency translation 57,000 688,000
Balance at $ 71,827,000 $ 68,719,000