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Goodwill and Intangible Assets (Intangible Assets) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
Total intangible assets      
Cost   $ 387,040 $ 387,040
Accumulated Amortization   (177,504) (150,858)
Accumulated Impairment Charge   (113,067) (113,067)
Carrying Value   96,469 123,115
Trade Names      
Finite-Lived intangible assets      
Cost   74,350 74,350
Accumulated Amortization   (25,620) (23,754)
Accumulated Impairment Charge   (23,232) (23,232)
Carrying Value   $ 25,498 27,364
Weighted-Average Amortization Period 20 years 20 years  
Customer relationships      
Finite-Lived intangible assets      
Cost   $ 39,800 39,800
Accumulated Amortization   (22,868) (22,103)
Accumulated Impairment Charge   (16,645) (16,645)
Carrying Value   $ 287 1,052
Weighted-Average Amortization Period 12 years 12 years  
Construction contract backlog      
Finite-Lived intangible assets      
Cost   $ 149,290 149,290
Accumulated Amortization   (129,016) (105,001)
Carrying Value   $ 20,274 44,289
Weighted-Average Amortization Period 3 years 3 years  
Trade Names      
Indefinite-lived intangible assets      
Cost   $ 117,600 117,600
Accumulated Impairment Charge   (67,190) (67,190)
Carrying Value   50,410 50,410
Contractor license      
Indefinite-lived intangible assets      
Cost   6,000 6,000
Accumulated Impairment Charge   $ (6,000) $ (6,000)