Annual report pursuant to Section 13 and 15(d)

Goodwill and Other Intangibles - Goodwill (Details)

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Goodwill and Other Intangibles - Goodwill (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Changes in the carrying amount of goodwill    
Number of reporting units | item 2  
Gross Goodwill, at beginning of period $ 2,126,037 $ 1,839,207
Additions 3,902 286,830
Gross Goodwill, at end of period 2,129,939 2,126,037
Accumulated Impairment Losses (762,021) (762,021)
Net Goodwill 1,367,918 1,364,016
Impairment of goodwill 0 0
USI    
Changes in the carrying amount of goodwill    
Net Goodwill 281,364  
Installation    
Changes in the carrying amount of goodwill    
Gross Goodwill, at beginning of period 1,679,654 1,422,920
Additions 3,935 256,734
Gross Goodwill, at end of period 1,683,589 1,679,654
Accumulated Impairment Losses (762,021) (762,021)
Net Goodwill 921,568 917,633
Distribution    
Changes in the carrying amount of goodwill    
Gross Goodwill, at beginning of period 446,383 416,287
Additions (33) 30,096
Gross Goodwill, at end of period 446,350 446,383
Net Goodwill $ 446,350 $ 446,383