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Goodwill and Other Intangibles - Goodwill (Details) $ in Thousands | 12 Months Ended
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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

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- Definition Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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