Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangibles - Goodwill (Details)

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Goodwill and Other Intangibles - Goodwill (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Changes in the carrying amount of goodwill    
Gross Goodwill $ 1,839,123 $ 1,807,079
Additions 32,044  
Accumulated Impairment Losses (762,021)  
Net Goodwill 1,077,102 1,045,058
Installation    
Changes in the carrying amount of goodwill    
Gross Goodwill 1,422,836 1,390,792
Additions 32,044  
Accumulated Impairment Losses (762,021)  
Net Goodwill 660,815  
Distribution    
Changes in the carrying amount of goodwill    
Gross Goodwill 416,287 $ 416,287
Net Goodwill $ 416,287