| Changes in the carrying amount of goodwill by segment |
Changes in the carrying amount of goodwill for the years ended December 31, 2020 and 2019, by segment, were as follows, in thousands:
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Accumulated |
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Gross Goodwill |
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Gross Goodwill |
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Impairment |
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Net Goodwill |
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December 31, 2019 |
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Additions |
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December 31, 2020 |
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Losses |
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December 31, 2020 |
Goodwill, by segment: |
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Installation |
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$ |
1,683,589 |
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$ |
42,767 |
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$ |
1,726,356 |
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$ |
(762,021) |
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$ |
964,335 |
Distribution |
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|
446,350 |
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— |
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|
446,350 |
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— |
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|
446,350 |
Total goodwill |
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$ |
2,129,939 |
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$ |
42,767 |
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$ |
2,172,706 |
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$ |
(762,021) |
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$ |
1,410,685 |
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Accumulated |
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Gross Goodwill |
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Gross Goodwill |
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Impairment |
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Net Goodwill |
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December 31, 2018 |
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Additions |
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December 31, 2019 |
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Losses |
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December 31, 2019 |
Goodwill, by segment: |
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Installation |
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$ |
1,679,654 |
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$ |
3,935 |
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$ |
1,683,589 |
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$ |
(762,021) |
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$ |
921,568 |
Distribution |
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|
446,383 |
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(33) |
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|
446,350 |
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— |
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|
446,350 |
Total goodwill |
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$ |
2,126,037 |
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$ |
3,902 |
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$ |
2,129,939 |
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$ |
(762,021) |
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$ |
1,367,918 |
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| Schedule of other intangible assets |
Other intangible assets, net includes customer relationships, non-compete agreements, and trademarks / trade names. The following table sets forth our other intangible assets, in thousands:
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As of December 31, |
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2020 |
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2019 |
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2018 |
Gross definite-lived intangible assets |
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$ |
252,751 |
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$ |
221,382 |
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$ |
218,882 |
Accumulated amortization |
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(62,146) |
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(40,260) |
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(19,495) |
Net definite-lived intangible assets |
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190,605 |
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|
181,122 |
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|
199,387 |
Indefinite-lived intangible assets not subject to amortization |
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— |
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— |
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— |
Other intangible assets, net |
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$ |
190,605 |
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$ |
181,122 |
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$ |
199,387 |
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Amortization expense |
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$ |
21,886 |
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$ |
20,765 |
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$ |
15,752 |
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| Future amortization expense related to definite-lived intangible assets |
The following table sets forth the amortization expense related to the definite-lived intangible assets during each of the next five years, in thousands:
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Amortization
Expense |
2021 |
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$ |
23,445 |
2022 |
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22,629 |
2023 |
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|
21,800 |
2024 |
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|
21,692 |
2025 |
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|
21,692 |
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