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Goodwill and Other Intangibles | 12 Months Ended
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Dec. 31, 2018
Goodwill and Other Intangibles |
Goodwill and Other Intangibles | 4. GOODWILL AND OTHER INTANGIBLES We have two reporting units which are also our operating and reporting segments: Installation and Distribution. Both reporting units contain goodwill. Assets acquired and liabilities assumed are assigned to the applicable reporting unit based on whether the acquired assets and liabilities relate to the operations of and determination of the fair value of such unit. Goodwill assigned to the reporting unit is the excess of the fair value of the acquired business over the fair value of the individual assets acquired and liabilities assumed for the reporting unit. In the fourth quarters of 2018 and 2017, we performed annual assessments on our goodwill resulting in no impairment. Changes in the carrying amount of goodwill for the years ended December 31, 2018 and 2017, by segment, were as follows, in thousands:
|  | Gross Goodwill |  |  |  | Gross Goodwill |  | Accumulated |  | Net Goodwill
|  | at |  |  |  | at |  | Impairment |  | at
|  | December 31, 2017 |  | Additions |  | December 31, 2018 |  | Losses |  | December 31, 2018
Goodwill, by segment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Installation |  | $ | 1,422,920 |  | $ | 256,734 |  | $ | 1,679,654 |  | $ | (762,021) |  | $ | 917,633
Distribution |  |  | 416,287 |  |  | 30,096 |  |  | 446,383 |  |  | — |  |  | 446,383
Total goodwill |  | $ | 1,839,207 |  | $ | 286,830 |  | $ | 2,126,037 |  | $ | (762,021) |  | $ | 1,364,016
|  | Gross Goodwill |  |  |  | Gross Goodwill |  | Accumulated |  | Net Goodwill
|  | at |  |  |  | at |  | Impairment |  | at
|  | December 31, 2016 |  | Additions |  | December 31, 2017 |  | Losses |  | December 31, 2017
Goodwill, by segment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Installation |  | $ | 1,390,792 |  | $ | 32,128 |  | $ | 1,422,920 |  | $ | (762,021) |  | $ | 660,899
Distribution |  |  | 416,287 |  |  | — |  |  | 416,287 |  |  | — |  |  | 416,287
Total goodwill |  | $ | 1,807,079 |  | $ | 32,128 |  | $ | 1,839,207 |  | $ | (762,021) |  | $ | 1,077,186
Other intangible assets, net includes customer relationships, non-compete agreements, and trademarks. The following table sets forth our other intangible assets and associated amortization expense, in thousands:
|  | As of
|  | December 31, |  | December 31, |  | December 31,
|  | 2018 |  | 2017 |  | 2016
Gross definite-lived intangible assets |  | $ | 218,882 |  | $ | 54,872 |  | $ | 20,932
Accumulated amortization |  |  | (19,495) |  |  | (21,629) |  |  | (18,683)
Net definite-lived intangible assets |  |  | 199,387 |  |  | 33,243 |  |  | 2,249
Indefinite-lived intangible assets not subject to amortization |  |  | — |  |  | — |  |  | 407
Other intangible assets, net |  | $ | 199,387 |  | $ | 33,243 |  | $ | 2,656
Amortization expense |  | $ | 15,752 |  | $ | 2,994 |  | $ | 795
The following table sets forth the amortization expense related to the definite-lived intangible assets during each of the next five years, in thousands:
|  | Amortization Expense
2019 |  | $ | 20,692
2020 |  |  | 20,692
2021 |  |  | 20,572
2022 |  |  | 19,713
2023 |  |  | 18,995
See Note 16 – Business Combinations for breakout by major intangible asset class and their weighted average estimated useful lives.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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