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Goodwill and Identifiable Intangible Assets, Net - Identifiable Intangible Assets, Net (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Identifiable Intangible Assets, Net |  |  |  |  |
Gross Book Value | $ 329,787 |  | $ 329,787 |  | $ 262,456
Accumulated Amortization | (119,623) |  | (119,623) |  | (102,482)
Amortization of identifiable intangible assets | 10,900 | $ 8,100 | 17,141 | $ 13,006 |
Future amortization expense of identifiable intangible assets |  |  |  |  |
2020 (remainder of the year) | 15,557 |  | 15,557 |  |
2021 | 24,610 |  | 24,610 |  |
2022 | 21,989 |  | 21,989 |  |
2023 | 20,535 |  | 20,535 |  |
2024 | 19,185 |  | 19,185 |  |
Thereafter | 108,288 |  | 108,288 |  |
Total | 210,164 |  | 210,164 |  |
Customer Relationships |  |  |  |  |
Identifiable Intangible Assets, Net |  |  |  |  |
Gross Book Value | 231,492 |  | 231,492 |  | 183,061
Accumulated Amortization | (91,882) |  | $ (91,882) |  | (80,813)
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 | 12,600 |  | $ 12,600 |  | 7,400
Accumulated Amortization | (10,822) |  | $ (10,822) |  | (6,388)
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 Name |  |  |  |  |
Identifiable Intangible Assets, Net |  |  |  |  |
Gross Book Value | 85,695 |  | $ 85,695 |  | 71,995
Accumulated Amortization | $ (16,919) |  | $ (16,919) |  | $ (15,281)
Trade Name | Minimum |  |  |  |  |
Identifiable Intangible Assets, Net |  |  |  |  |
Estimated Useful Lives in Years |  |  | 2 years |  |
Trade Name | 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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