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Goodwill and Intangible Assets (Schedule of Changes in Carrying Amount of Goodwill) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Goodwill [Line Items] |  |
Gross goodwill as of December 31, 2024 |  | $ 1,072,991
Accumulated impairment as of December 31, 2024 |  | (867,848)
Goodwill [Roll Forward] |  |
Balance at beginning of period | $ 205,143 |
Current year activity | 0 |
Balance at end of period | 205,143 |
Civil |  |
Goodwill [Line Items] |  |
Gross goodwill as of December 31, 2024 |  | 492,074
Accumulated impairment as of December 31, 2024 |  | (286,931)
Goodwill [Roll Forward] |  |
Balance at beginning of period | 205,143 |
Current year activity | 0 |
Balance at end of period | 205,143 |
Building |  |
Goodwill [Line Items] |  |
Gross goodwill as of December 31, 2024 |  | 424,724
Accumulated impairment as of December 31, 2024 |  | (424,724)
Goodwill [Roll Forward] |  |
Balance at beginning of period | 0 |
Current year activity | 0 |
Balance at end of period | 0 |
Specialty Contractors |  |
Goodwill [Line Items] |  |
Gross goodwill as of December 31, 2024 |  | 156,193
Accumulated impairment as of December 31, 2024 |  | $ (156,193)
Goodwill [Roll Forward] |  |
Balance at beginning of period | 0 |
Current year activity | 0 |
Balance at end of period | $ 0 |

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