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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2025
Goodwill and Intangible Assets |
Schedule of goodwill by reporting unit | The carrying amount of goodwill by reportable segment was as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
Reporting Segment |  | 2025 |  | 2024
Utilities |  | $ | 703,462 | ​ | $ | 703,462
Energy |  |  | 153,407 | ​ |  | 153,407
Total Goodwill | ​ | $ | 856,869 | ​ | $ | 856,869
​
Summary of intangible asset categories, amounts and the average amortization periods | The table below summarizes the intangible asset categories and amounts, which are amortized on a straight-line basis (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | June 30, 2025 | ​ | December 31, 2024
​ | Gross Carrying Amount |  | Accumulated Amortization |  | Intangible Assets, Net |  | Gross Carrying Amount |  | Accumulated Amortization |  | Intangible Assets, Net
Tradenames | $ | 19,220 | ​ | $ | (19,067) | ​ | $ | 153 | ​ | $ | 19,220 | ​ | $ | (18,151) | ​ | $ | 1,069
Customer relationships |  | 295,977 | ​ |  | (97,467) | ​ |  | 198,510 | ​ |  | 295,977 | ​ |  | (89,150) | ​ |  | 206,827
Total | $ | 315,197 | ​ | $ | (116,534) | ​ | $ | 198,663 | ​ | $ | 315,197 | ​ | $ | (107,301) | ​ | $ | 207,896
Schedule of estimated future amortization expense for intangible assets | Estimated future amortization expense for intangible assets is as follows (in thousands): ​
​ | ​ | ​ | ​
​ | ​ | Estimated
​ | ​ | Intangible
​ | ​ | Amortization
For the Years Ending December 31, |  | Expense
2025 (remaining six months) | ​ | ​ | 8,422
2026 | ​ |  | 16,135
2027 | ​ |  | 15,598
2028 | ​ |  | 14,375
2029 | ​ |  | 14,375
Thereafter | ​ |  | 129,758
​ | ​ | $ | 198,663
​

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