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Goodwill and Intangibles (Tables) | 6 Months Ended
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Jun. 30, 2018
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 |  |  | 7,086 |  |  |  | — |  |  |  | 7,086 |
Other |  |  | 471 |  |  |  | — |  |  |  | 471 |
June 30, 2018 |  | $ | 233,027 |  |  | $ | (70,004 | ) |  | $ | 163,023 |
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 June 30, 2018 |  |  | As of December 31, 2017 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Book Value |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Book Value |
Amortized intangibles: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ | 127,900 |  |  | $ | 45,211 |  |  | $ | 82,689 |  |  | $ | 121,015 |  |  | $ | 38,651 |  |  | $ | 82,364 |
Covenants not-to-compete |  |  | 12,715 |  |  |  | 6,120 |  |  |  | 6,595 |  |  |  | 11,807 |  |  |  | 4,773 |  |  |  | 7,034 |
Trademarks and trade names |  |  | 61,068 |  |  |  | 16,119 |  |  |  | 44,949 |  |  |  | 58,136 |  |  |  | 14,076 |  |  |  | 44,060 |
Backlog |  |  | 13,600 |  |  |  | 13,600 |  |  |  | — |  |  |  | 13,600 |  |  |  | 9,067 |  |  |  | 4,533 |
|  | $ | 215,283 |  |  | $ | 81,050 |  |  | $ | 134,233 |  |  | $ | 204,558 |  |  | $ | 66,567 |  |  | $ | 137,991 |
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 2018 |  |  | 10,084 |
2019 |  |  | 19,685 |
2020 |  |  | 18,893 |
2021 |  |  | 17,850 |
2022 |  |  | 16,932 |
Thereafter |  |  | 50,789 |

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