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Goodwill and Identifiable Intangible Assets, Net (Tables) | 12 Months Ended
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Dec. 31, 2023
Goodwill and Identifiable Intangible Assets, Net |
Schedule of changes in the carrying amount of goodwill | The changes in the carrying amount of goodwill are as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Mechanical Segment |  | Electrical Segment | ​ | Total |
Balance at December 31, 2021 | ​ | $ | 361,320 | ​ | $ | 230,794 | ​ | $ | 592,114 | ​
Acquisitions and purchase price adjustments (See Note 5) | ​ |  | 2,609 | ​ | ​ | 17,066 | ​ | ​ | 19,675 | ​
Balance at December 31, 2022 | ​ | ​ | 363,929 | ​ | ​ | 247,860 | ​ | ​ | 611,789 | ​
Acquisitions and purchase price adjustments (See Note 5) | ​ | ​ | 29,347 | ​ | ​ | 25,698 | ​ | ​ | 55,045 | ​
Balance at December 31, 2023 | ​ | $ | 393,276 | ​ | $ | 273,558 | ​ | $ | 666,834 | ​
Schedule of components of identifiable intangible assets | Identifiable intangible assets consist of the following (dollars in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Weighted-Average | ​ | December 31, 2023 | ​ | December 31, 2022
​ |  | Remaining Useful Lives |  | Gross Book |  | Accumulated |  | Gross Book |  | Accumulated
​ |  | in Years |  | Value |  | Amortization |  | Value |  | Amortization
Customer Relationships |  | 6.4 | ​ | $ | 376,621 | ​ | $ | (193,338) | ​ | $ | 340,721 | ​ | $ | (161,049)
Backlog |  | 0.6 | ​ |  | 5,900 | ​ |  | (4,331) | ​ |  | 3,200 | ​ |  | (2,361)
Trade Names |  | 17.6 | ​ |  | 129,661 | ​ |  | (34,116) | ​ |  | 121,561 | ​ |  | (28,171)
Total | ​ | ​ | ​ | $ | 512,182 | ​ | $ | (231,785) | ​ | $ | 465,482 | ​ | $ | (191,581)
Schedule of future amortization expense of identifiable intangible assets | As of December 31, 2023, future amortization expense of identifiable intangible assets was as follows (in thousands):
​ | ​ | ​ | ​ | ​
Year ending December 31— |  | ​ |  | ​
2024 | ​ | $ | 39,851 | ​
2025 | ​ |  | 36,095 | ​
2026 | ​ |  | 35,251 | ​
2027 | ​ |  | 33,269 | ​
2028 | ​ | ​ | 33,109 | ​
Thereafter | ​ |  | 102,822 | ​
Total | ​ | $ | 280,397 | ​
​

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