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Goodwill and Identifiable Intangible Assets, Net (Tables) | 9 Months Ended
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Sep. 30, 2019
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, 2017 | ​ | $ | 200,584 | ​ | $ | — | ​ | $ | 200,584
Additions (See Note 4) | ​ |  | 34,598 | ​ |  | — | ​ | ​ | 34,598
Impairment adjustment | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Balance at December 31, 2018 | ​ | ​ | 235,182 | ​ | ​ | — | ​ | ​ | 235,182
Additions (See Note 4) | ​ | ​ | 579 | ​ | ​ | 96,439 | ​ | ​ | 97,018
Impact of segment reorganization | ​ | ​ | (1,101) | ​ | ​ | 1,101 | ​ | ​ | —
Impairment adjustment | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Balance at September 30, 2019 | ​ | $ | 234,660 | ​ | $ | 97,540 | ​ | $ | 332,200
Schedule of components of identifiable intangible assets | ​ Identifiable intangible assets consist of the following (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Estimated | ​ | September 30, 2019 | ​ | December 31, 2018
​ |  | Useful Lives |  | Gross Book |  | Accumulated |  | Gross Book |  | Accumulated
​ |  | in Years |  | Value |  | Amortization |  | Value |  | Amortization
Customer relationships |  | 1 - 15 | ​ | $ | 182,963 | ​ | $ | (75,455) | ​ | $ | 128,480 | ​ | $ | (60,731)
Backlog |  | 1 - 2 | ​ |  | 13,700 | ​ |  | (11,906) | ​ |  | 9,100 | ​ |  | (8,260)
Tradenames |  | 2 - 25 | ​ |  | 71,995 | ​ |  | (14,561) | ​ |  | 39,395 | ​ |  | (12,709)
Total | ​ | ​ | ​ | $ | 268,658 | ​ | $ | (101,922) | ​ | $ | 176,975 | ​ | $ | (81,700)
Schedule of future amortization expense of identifiable intangible assets | ​ At September 30, 2019, future amortization expense of identifiable intangible assets is as follows (in thousands): ​
​ | ​ | ​ | ​ | ​
Year ended December 31— |  | ​ |  | ​
2019 (remainder of the year) |  | $ | 6,844 |
2020 | ​ |  | 23,213 | ​
2021 | ​ |  | 19,158 | ​
2022 | ​ |  | 16,536 | ​
2023 | ​ |  | 15,082 | ​
Thereafter | ​ |  | 85,903 | ​
Total | ​ | $ | 166,736 | ​

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