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Goodwill and Intangibles (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Change in Carrying Amount of Goodwill | The change in carrying amount of goodwill was as follows (in thousands):
|  | Goodwill (Gross) |  |  | Accumulated Impairment Losses |  |  | Goodwill (Net) |
January 1, 2018 |  | $ | 225,470 |  |  | $ | (70,004 | ) |  | $ | 155,466 |
Business combinations |  |  | 17,023 |  |  |  | — |  |  |  | 17,023 |
Other |  |  | 560 |  |  |  | — |  |  |  | 560 |
December 31, 2018 |  |  | 243,053 |  |  |  | (70,004 | ) |  |  | 173,049 |
Business combinations |  |  | 22,405 |  |  |  | — |  |  |  | 22,405 |
Other |  |  | 198 |  |  |  | — |  |  |  | 198 |
December 31, 2019 |  | $ | 265,656 |  |  | $ | (70,004 | ) |  | $ | 195,652 |
Schedule of Gross Carrying Amount, Accumulated Amortization and Net Book Value | The following table provides the gross carrying amount, accumulated amortization and net book value for each major class of intangibles (in thousands):
|  | As of December 31, |
|  | 2019 |  |  | 2018 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Book Value |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Book Value |
Amortized intangibles: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ | 169,334 |  |  | $ | 69,388 |  |  | $ | 99,946 |  |  | $ | 148,635 |  |  | $ | 52,514 |  |  | $ | 96,121 |
Covenants not-to-compete |  |  | 16,959 |  |  |  | 10,617 |  |  |  | 6,342 |  |  |  | 14,682 |  |  |  | 7,572 |  |  |  | 7,110 |
Trademarks and tradenames |  |  | 69,718 |  |  |  | 22,609 |  |  |  | 47,109 |  |  |  | 64,432 |  |  |  | 18,256 |  |  |  | 46,176 |
Backlog |  |  | 14,080 |  |  |  | 13,915 |  |  |  | 165 |  |  |  | 14,060 |  |  |  | 13,677 |  |  |  | 383 |
|  | $ | 270,091 |  |  | $ | 116,529 |  |  | $ | 153,562 |  |  | $ | 241,809 |  |  | $ | 92,019 |  |  | $ | 149,790 |
Schedule of Estimated Aggregate Annual Amortization | Remaining estimated aggregate annual amortization expense is as follows (in thousands):
2020 |  | $ | 25,741 |
2021 |  |  | 24,399 |
2022 |  |  | 23,479 |
2023 |  |  | 20,568 |
2024 |  |  | 17,053 |
Thereafter |  |  | 42,322 |

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