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Goodwill and Identifiable Intangible Assets, Net (Tables) | 9 Months Ended
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Sep. 30, 2021
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 Services | ​ | Electrical Services | ​ | ​
​ |  | Segment |  | Segment | ​ | Total
Balance at December 31, 2019 | ​ | $ | 234,660 | ​ | $ | 97,787 | ​ | $ | 332,447
Acquisitions and purchase price adjustments (See Note 5) | ​ |  | 72,788 | ​ | ​ | 59,157 | ​ | ​ | 131,945
Balance at December 31, 2020 | ​ | ​ | 307,448 | ​ | ​ | 156,944 | ​ | ​ | 464,392
Acquisitions and purchase price adjustments (See Note 5) | ​ | ​ | 8,089 | ​ | ​ | 54,483 | ​ | ​ | 62,572
Impact of segment reorganization | ​ | ​ | 1,101 | ​ | ​ | (1,101) | ​ | ​ | —
Balance at September 30, 2021 | ​ | $ | 316,638 | ​ | $ | 210,326 | ​ | $ | 526,964
Schedule of future amortization expense of identifiable intangible assets | At September 30, 2021, future amortization expense of identifiable intangible assets is as follows (in thousands): ​
​ | ​ | ​ | ​ | ​
Year ended December 31— |  | ​ |  | ​
2021 (remainder of the year) |  | $ | 11,021 |
2022 | ​ | ​ | 36,968 | ​
2023 | ​ |  | 28,495 | ​
2024 | ​ |  | 27,145 | ​
2025 | ​ |  | 24,958 | ​
Thereafter | ​ |  | 139,512 | ​
Total | ​ | $ | 268,099 | ​

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