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Goodwill, Identifiable Intangible Assets, And Other Long-Lived Assets (Tables) | 12 Months Ended
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Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The changes in the carrying amount of goodwill by reportable segment during the years ended December 31, 2022 and 2021 were as follows (in thousands):
| United States electrical construction and facilities services segment |  | United States mechanical construction and facilities services segment |  | United States building services segment |  | United States industrial services segment |  | Total
Balance at December 31, 2020 | $ | 142,545 |  |  | $ | 299,618 |  |  | $ | 302,132 |  |  | $ | 107,488 |  |  | $ | 851,783 |
Acquisitions and purchase price adjustments | 24,467 |  |  | 4,269 |  |  | 9,749 |  |  | — |  |  | 38,485 |
Intersegment transfers | (7,500) |  |  | — |  |  | 900 |  |  | 6,600 |  |  | — |
Balance at December 31, 2021 | 159,512 |  |  | 303,887 |  |  | 312,781 |  |  | 114,088 |  |  | 890,268 |
Acquisitions and purchase price adjustments | 17,601 |  |  | 6,942 |  |  | 4,340 |  |  | — |  |  | 28,883 |
Intersegment transfers | 900 |  |  | 4,500 |  |  | (5,400) |  |  | — |  |  | — |
Balance at December 31, 2022 | $ | 178,013 |  |  | $ | 315,329 |  |  | $ | 311,721 |  |  | $ | 114,088 |  |  | $ | 919,151 |
Schedule of Intangible Assets | Identifiable intangible assets as of December 31, 2022 and 2021 consisted of the following (in thousands):
| December 31, 2022
| Gross Carrying Amount |  | Accumulated Amortization |  | Accumulated Impairment Charge |  | Total
Customer relationships | $ | 762,516 |  |  | $ | (427,211) |  |  | $ | (4,834) |  |  | $ | 330,471 |
Trade names (indefinite-lived) | 289,121 |  |  | — |  |  | (58,933) |  |  | 230,188 |
Developed technology/Vendor network | 95,661 |  |  | (74,238) |  |  | — |  |  | 21,423 |
Trade names (finite-lived) | 33,791 |  |  | (25,690) |  |  | — |  |  | 8,101 |
Contract backlog | 83,245 |  |  | (79,453) |  |  | — |  |  | 3,792 |
Total | $ | 1,264,334 |  |  | $ | (606,592) |  |  | $ | (63,767) |  |  | $ | 593,975 |
| December 31, 2021
| Gross Carrying Amount |  | Accumulated Amortization |  | Accumulated Impairment Charge |  | Total
Customer relationships | $ | 717,666 |  |  | $ | (374,764) |  |  | $ | (4,834) |  |  | $ | 338,068 |
Trade names (indefinite-lived) | 274,721 |  |  | — |  |  | (58,933) |  |  | 215,788 |
Developed technology/Vendor network | 95,661 |  |  | (69,688) |  |  | — |  |  | 25,973 |
Trade names (finite-lived) | 32,366 |  |  | (24,180) |  |  | — |  |  | 8,186 |
Contract backlog | 77,995 |  |  | (76,645) |  |  | — |  |  | 1,350 |
Total | $ | 1,198,409 |  |  | $ | (545,277) |  |  | $ | (63,767) |  |  | $ | 589,365 |
Schedule of Estimated Future Amortization Expense | The following table presents the estimated future amortization expense of identifiable intangible assets in the following years (in thousands):
2023 | $ | 63,366 |
2024 | 59,507 |
2025 | 58,002 |
2026 | 51,883 |
2027 | 38,949 |
Thereafter | 92,080 |
| $ | 363,787 |

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- Definition Tabular disclosure of finite and indefinite lived intangible assets, in total and by major class, including the gross carrying amount and accumulated amortization. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References No definition available. + Details
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