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, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
Changes in the carrying amount of goodwill    
Number of reporting units | item 2  
Gross Goodwill, at beginning of period $ 1,839,207 $ 1,807,079
Additions 286,830 32,128
Gross Goodwill, at end of period 2,126,037 1,839,207
Accumulated Impairment Losses (762,021) (762,021)
Net Goodwill 1,364,016 1,077,186
Impairment of goodwill 0 0
Installation    
Changes in the carrying amount of goodwill    
Gross Goodwill, at beginning of period 1,422,920 1,390,792
Additions 256,734 32,128
Gross Goodwill, at end of period 1,679,654 1,422,920
Accumulated Impairment Losses (762,021) (762,021)
Net Goodwill 917,633 660,899
Distribution    
Changes in the carrying amount of goodwill    
Gross Goodwill, at beginning of period 416,287 416,287
Additions 30,096  
Gross Goodwill, at end of period 446,383 416,287
Net Goodwill $ 446,383 $ 416,287