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Goodwill and Intangibles (Tables) | 6 Months Ended
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Jun. 30, 2017
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, 2017 |  | $ | 177,090 |  |  | $ | (70,004 | ) |  | $ | 107,086 |
Business Combinations |  |  | 40,487 |  |  |  | — |  |  |  | 40,487 |
Other |  |  | 458 |  |  |  | — |  |  |  | 458 |
June 30, 2017 |  | $ | 218,035 |  |  | $ | (70,004 | ) |  | $ | 148,031 |
Schedule of Gross Carrying Amount and Accumulated Amortization | The following table provides the gross carrying amount and accumulated amortization for each major class of intangibles (in thousands):
|  | As of June 30, 2017 |  |  | As of December 31, 2016 |
|  | Gross |  |  |  |  |  | Net |  |  | Gross |  |  |  |  |  | Net |
|  | Carrying |  |  | Accumulated |  |  | Book |  |  | Carrying |  |  | Accumulated |  |  | Book |
|  | Amount |  |  | Amortization |  |  | Value |  |  | Amount |  |  | Amortization |  |  | Value |
Amortized intangibles: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ | 113,606 |  |  | $ | 32,517 |  |  | $ | 81,089 |  |  | $ | 80,909 |  |  | $ | 27,533 |  |  | $ | 53,376 |
Covenants not-to-compete |  |  | 10,524 |  |  |  | 3,548 |  |  |  | 6,976 |  |  |  | 8,602 |  |  |  | 2,466 |  |  |  | 6,136 |
Trademarks and trade names |  |  | 54,568 |  |  |  | 12,140 |  |  |  | 42,428 |  |  |  | 37,303 |  |  |  | 10,498 |  |  |  | 26,805 |
Backlog |  |  | 13,400 |  |  |  | 4,467 |  |  |  | 8,933 |  |  |  | — |  |  |  | — |  |  |  | — |
|  | $ | 192,098 |  |  | $ | 52,672 |  |  | $ | 139,426 |  |  | $ | 126,814 |  |  | $ | 40,497 |  |  | $ | 86,317 |
Schedule of Estimated Aggregate Annual Amortization | Remaining estimated aggregate annual amortization expense is as follows (amounts, in thousands, are for the fiscal year ended):
Remainder of 2017 |  | $ | 13,355 |
2018 |  |  | 21,899 |
2019 |  |  | 16,927 |
2020 |  |  | 16,328 |
2021 |  |  | 15,310 |
Thereafter |  |  | 55,607 |

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