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Goodwill and Related Intangible Assets (Narrative) (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Oct. 31, 2015
reporting_unit
Dec. 31, 2016
USD ($)
reporting_unit
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Oct. 31, 2016
USD ($)
Oct. 11, 2016
USD ($)
Goodwill [Line Items]            
Goodwill   $ 304,032 $ 292,390 $ 236,044    
Accumulated impairment losses   $ 235,419 255,530      
Number of reporting units tested | reporting_unit 9          
Number of reporting units | reporting_unit   10        
Goodwill impairment   $ (929)   (104,565)    
Impairment of indefinite-lived intangibles   9,048 4,863 2,700    
Impairment of indefinite-lived intangible assets attributable to annual impairment testing   1,200        
Impairment of definite-lived intangibles   198 0 705    
Industrial and Infrastructure Products            
Goodwill [Line Items]            
Goodwill impairment       (90,330)    
Impairment of indefinite-lived intangibles   7,980 4,423 1,500    
Impairment of definite-lived intangibles   0 0 705    
Residential Products            
Goodwill [Line Items]            
Goodwill impairment       (14,235)    
Impairment of indefinite-lived intangibles   0 440 1,200    
Impairment of definite-lived intangibles   0 $ 0 $ 0    
Carrying Value            
Goodwill [Line Items]            
Goodwill net book value         $ 23,300  
Solar | Residential Products            
Goodwill [Line Items]            
Goodwill impairment   (929)        
Disposal Group, Not Discontinued Operations            
Goodwill [Line Items]            
Impairment of indefinite-lived intangibles   $ 7,800        
Nexus            
Goodwill [Line Items]            
Goodwill           $ 12,283