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Goodwill and Identifiable Intangible Assets, Net (Tables) | 3 Months Ended
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Mar. 31, 2025
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, 2023 | ​ | $ | 393,276 | ​ | $ | 273,558 | ​ | $ | 666,834
Acquisitions and purchase price adjustments (See Note 5) | ​ |  | 208,236 | ​ | ​ | 200 | ​ | ​ | 208,436
Balance at December 31, 2024 | ​ | ​ | 601,512 | ​ | ​ | 273,758 | ​ | ​ | 875,270
Acquisitions and purchase price adjustments (See Note 5) | ​ | ​ | 30,573 | ​ | ​ | — | ​ | ​ | 30,573
Balance at March 31, 2025 | ​ | $ | 632,085 | ​ | $ | 273,758 | ​ | $ | 905,843
Schedule of future amortization expense of identifiable intangible assets | At March 31, 2025, future amortization expense of identifiable intangible assets is as follows (in thousands): ​
​ | ​ | ​ | ​ | ​
Year ending December 31— |  | ​ |  | ​
2025 (remainder of the year) | ​ | $ | 51,221 | ​
2026 | ​ |  | 58,766 | ​
2027 | ​ |  | 56,282 | ​
2028 | ​ |  | 54,735 | ​
2029 | ​ | ​ | 48,468 | ​
Thereafter | ​ |  | 172,030 | ​
Total | ​ | $ | 441,502 | ​
​

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