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Goodwill and Identifiable Intangible Assets, Net - Identifiable Intangible Assets, Net (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Identifiable Intangible Assets, Net |  |  |  |  |
Gross Book Value | $ 268,658 |  | $ 268,658 |  | $ 176,975
Accumulated Amortization | (101,922) |  | (101,922) |  | (81,700)
Amortization of identifiable intangible assets | 7,200 | $ 5,300 | 20,221 | $ 14,102 |
Future amortization expense of identifiable intangible assets |  |  |  |  |
2019 (remainder of the year) | 6,844 |  | 6,844 |  |
2020 | 23,213 |  | 23,213 |  |
2021 | 19,158 |  | 19,158 |  |
2022 | 16,536 |  | 16,536 |  |
2023 | 15,082 |  | 15,082 |  |
Thereafter | 85,903 |  | 85,903 |  |
Total | 166,736 |  | 166,736 |  |
Customer Relationships |  |  |  |  |
Identifiable Intangible Assets, Net |  |  |  |  |
Gross Book Value | 182,963 |  | 182,963 |  | 128,480
Accumulated Amortization | (75,455) |  | $ (75,455) |  | (60,731)
Customer Relationships | Minimum |  |  |  |  |
Identifiable Intangible Assets, Net |  |  |  |  |
Estimated Useful Lives in Years |  |  | 1 year |  |
Customer Relationships | Maximum |  |  |  |  |
Identifiable Intangible Assets, Net |  |  |  |  |
Estimated Useful Lives in Years |  |  | 15 years |  |
Backlog |  |  |  |  |
Identifiable Intangible Assets, Net |  |  |  |  |
Gross Book Value | 13,700 |  | $ 13,700 |  | 9,100
Accumulated Amortization | (11,906) |  | $ (11,906) |  | (8,260)
Backlog | Minimum |  |  |  |  |
Identifiable Intangible Assets, Net |  |  |  |  |
Estimated Useful Lives in Years |  |  | 1 year |  |
Backlog | Maximum |  |  |  |  |
Identifiable Intangible Assets, Net |  |  |  |  |
Estimated Useful Lives in Years |  |  | 2 years |  |
Trade Names |  |  |  |  |
Identifiable Intangible Assets, Net |  |  |  |  |
Gross Book Value | 71,995 |  | $ 71,995 |  | 39,395
Accumulated Amortization | $ (14,561) |  | $ (14,561) |  | $ (12,709)
Trade Names | Minimum |  |  |  |  |
Identifiable Intangible Assets, Net |  |  |  |  |
Estimated Useful Lives in Years |  |  | 2 years |  |
Trade Names | Maximum |  |  |  |  |
Identifiable Intangible Assets, Net |  |  |  |  |
Estimated Useful Lives in Years |  |  | 25 years |  |
Customer Relationships Noncompete Agreements and Tradenames | Minimum |  |  |  |  |
Identifiable Intangible Assets, Net |  |  |  |  |
Estimated Useful Lives in Years |  |  | 1 year |  |
Customer Relationships Noncompete Agreements and Tradenames | Maximum |  |  |  |  |
Identifiable Intangible Assets, Net |  |  |  |  |
Estimated Useful Lives in Years |  |  | 25 years |  |

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