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Goodwill and Identifiable Intangible Assets, Net - Identifiable Intangible Assets, Net (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Identifiable Intangible Assets, Net |  |  |
Gross Book Value | $ 262,456 | $ 176,975 |
Accumulated Amortization | (102,482) | (81,700) |
Amortization of identifiable intangible assets | 27,082 | 20,089 | $ 17,404
Future amortization expense of identifiable intangible assets |  |  |
2020 | 23,246 |  |
2021 | 19,191 |  |
2022 | 16,545 |  |
2023 | 15,082 |  |
2024 | 13,732 |  |
Thereafter | 72,178 |  |
Total | 159,974 |  |
Customer Relationships |  |  |
Identifiable Intangible Assets, Net |  |  |
Gross Book Value | 183,061 | 128,480 |
Accumulated Amortization | $ (80,813) | (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 | $ 7,400 | 9,100 |
Accumulated Amortization | $ (6,388) | (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 | 39,395 |
Accumulated Amortization | $ (15,281) | $ (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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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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