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Goodwill and Identifiable Intangible Assets, Net (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2018 | ​ | $ | 235,182 | ​ | $ | — | ​ | $ | 235,182
Acquisitions and purchase price adjustments (See Note 5) | ​ |  | 579 | ​ |  | 96,686 | ​ | ​ | 97,265
Impact of segment reorganization | ​ | ​ | (1,101) | ​ | ​ | 1,101 | ​ | ​ | —
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
Schedule of components of identifiable intangible assets | Identifiable intangible assets consist of the following (dollars in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Weighted-Average | ​ | December 31, 2020 | ​ | December 31, 2019
​ |  | Remaining Useful Lives |  | Gross Book |  | Accumulated |  | Gross Book |  | Accumulated
​ |  | in Years |  | Value |  | Amortization |  | Value |  | Amortization
Customer Relationships |  | 8.0 | ​ | $ | 255,692 | ​ | $ | (103,919) | ​ | $ | 183,061 | ​ | $ | (80,813)
Backlog |  | 2.0 | ​ |  | 19,800 | ​ |  | (12,600) | ​ |  | 7,400 | ​ |  | (6,388)
Trade Names |  | 20.5 | ​ |  | 91,495 | ​ |  | (18,661) | ​ |  | 71,995 | ​ |  | (15,281)
Total | ​ | 11.7 | ​ | $ | 366,987 | ​ | $ | (135,180) | ​ | $ | 262,456 | ​ | $ | (102,482)
​
Schedule of future amortization expense of identifiable intangible assets | As of December 31, 2020, future amortization expense of identifiable intangible assets was as follows (in thousands):
​ | ​ | ​ | ​ | ​
Year ended December 31— |  | ​ |  | ​
2021 | ​ | $ | 32,344 | ​
2022 | ​ |  | 27,412 | ​
2023 | ​ |  | 23,514 | ​
2024 | ​ |  | 22,164 | ​
2025 | ​ | ​ | 19,977 | ​
Thereafter | ​ |  | 106,396 | ​
Total | ​ | $ | 231,807 | ​

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