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Goodwill and Other Intangibles - Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Changes in the carrying amount of goodwill |  |  |
Gross Goodwill | $ 1,839,207 | $ 1,807,079 | $ 1,806,062
Additions | 32,128 | 1,017 |
Accumulated Impairment Losses | (762,021) | (762,021) |
Net Goodwill | 1,077,186 | 1,045,058 |
Impairment of goodwill | 0 | 0 |
Installation |  |  |
Changes in the carrying amount of goodwill |  |  |
Gross Goodwill | 1,422,920 | 1,390,792 | 1,389,775
Additions | 32,128 | 1,017 |
Accumulated Impairment Losses | (762,021) | (762,021) |
Net Goodwill | 660,899 | 628,771 |
Distribution |  |  |
Changes in the carrying amount of goodwill |  |  |
Gross Goodwill | 416,287 | 416,287 | $ 416,287
Net Goodwill | $ 416,287 | $ 416,287 |

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- Definition Amount after 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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