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Goodwill and Identifiable Intangible Assets, Net - Identifiable Intangible Assets, Net (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Identifiable Intangible Assets, Net |  |  |
Estimated Useful Lives in Years | 11 years 8 months 12 days |  |
Gross Book Value | $ 366,987 | $ 262,456 |
Accumulated Amortization | (135,180) | (102,482) |
Amortization of identifiable intangible assets | 32,698 | 27,082 | $ 20,089
Future amortization expense of identifiable intangible assets |  |  |
2021 | 32,344 |  |
2022 | 27,412 |  |
2023 | 23,514 |  |
2024 | 22,164 |  |
2025 | 19,977 |  |
Thereafter | 106,396 |  |
Total | $ 231,807 |  |
Customer Relationships |  |  |
Identifiable Intangible Assets, Net |  |  |
Estimated Useful Lives in Years | 8 years |  |
Gross Book Value | $ 255,692 | 183,061 |
Accumulated Amortization | $ (103,919) | (80,813) |
Customer Relationships | Minimum |  |  |
Identifiable Intangible Assets, Net |  |  |
Estimated Useful Lives in Years | 8 years |  |
Backlog |  |  |
Identifiable Intangible Assets, Net |  |  |
Estimated Useful Lives in Years | 2 years |  |
Gross Book Value | $ 19,800 | 7,400 |
Accumulated Amortization | $ (12,600) | (6,388) |
Backlog | Minimum |  |  |
Identifiable Intangible Assets, Net |  |  |
Estimated Useful Lives in Years | 2 years |  |
Trade Name |  |  |
Identifiable Intangible Assets, Net |  |  |
Estimated Useful Lives in Years | 20 years 6 months |  |
Gross Book Value | $ 91,495 | 71,995 |
Accumulated Amortization | $ (18,661) | $ (15,281) |
Trade Name | Minimum |  |  |
Identifiable Intangible Assets, Net |  |  |
Estimated Useful Lives in Years | 20 years 6 months |  |
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=121586364&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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