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Goodwill and Identifiable Intangible Assets, Net (Tables) | 9 Months Ended
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Sep. 30, 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 4) | ​ |  | 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 4) | ​ | ​ | 73,409 | ​ | ​ | 14,926 | ​ | ​ | 88,335
Balance at September 30, 2020 | ​ | $ | 308,069 | ​ | $ | 112,713 | ​ | $ | 420,782
Schedule of components of identifiable intangible assets | Identifiable intangible assets consist of the following (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Estimated | ​ | September 30, 2020 | ​ | December 31, 2019
​ |  | Useful Lives |  | Gross Book |  | Accumulated |  | Gross Book |  | Accumulated
​ |  | in Years |  | Value |  | Amortization |  | Value |  | Amortization
Customer relationships |  | 1 - 15 | ​ | $ | 231,492 | ​ | $ | (97,901) | ​ | $ | 183,061 | ​ | $ | (80,813)
Backlog |  | 1 - 2 | ​ |  | 12,600 | ​ |  | (12,098) | ​ |  | 7,400 | ​ |  | (6,388)
Tradenames |  | 2 - 25 | ​ |  | 85,695 | ​ |  | (17,790) | ​ |  | 71,995 | ​ |  | (15,281)
Total | ​ | ​ | ​ | $ | 329,787 | ​ | $ | (127,789) | ​ | $ | 262,456 | ​ | $ | (102,482)
Schedule of future amortization expense of identifiable intangible assets | At September 30, 2020, future amortization expense of identifiable intangible assets is as follows (in thousands): ​
​ | ​ | ​ | ​ | ​
Year ended December 31— |  | ​ |  | ​
2020 (remainder of the year) |  | $ | 7,391 |
2021 | ​ |  | 24,610 | ​
2022 | ​ |  | 21,989 | ​
2023 | ​ |  | 20,535 | ​
2024 | ​ |  | 19,185 | ​
Thereafter | ​ |  | 108,288 | ​
Total | ​ | $ | 201,998 | ​

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