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Goodwill and Intangible Assets (Changes in Carrying Amount of Goodwill) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Line Items] |  |  |
Gross goodwill as of December 31, 2018 |  |  | $ 1,072,991
Accumulated impairment as of December 31, 2018 | $ (867,800) |  | (487,985)
Balance at beginning of period | 205,143 | $ 585,006 |
Goodwill impairment | 0 | (379,863) | 0
Current year activity | 0 |  |
Balance at end of period | 205,143 | 205,143 | 585,006
Civil |  |  |
Goodwill [Line Items] |  |  |
Gross goodwill as of December 31, 2018 |  |  | 492,074
Accumulated impairment as of December 31, 2018 |  |  | (76,716)
Balance at beginning of period | 205,143 | 415,358 |
Goodwill impairment |  | (210,215) |
Current year activity | 0 |  |
Balance at end of period | 205,143 | 205,143 | 415,358
Building |  |  |
Goodwill [Line Items] |  |  |
Gross goodwill as of December 31, 2018 |  |  | 424,724
Accumulated impairment as of December 31, 2018 |  |  | (411,269)
Balance at beginning of period | 0 | 13,455 |
Goodwill impairment |  | (13,455) |
Current year activity | 0 |  |
Balance at end of period | 0 | 0 | 13,455
Specialty Contractors |  |  |
Goodwill [Line Items] |  |  |
Gross goodwill as of December 31, 2018 |  |  | 156,193
Accumulated impairment as of December 31, 2018 |  |  | 0
Balance at beginning of period | 0 | 156,193 |
Goodwill impairment |  | (156,193) |
Current year activity | 0 |  |
Balance at end of period | $ 0 | $ 0 | $ 156,193

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