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Goodwill and Intangible Assets (Intangible Assets) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Total intangible assets    
Cost $ 387,040 $ 387,040
Accumulated Amortization (157,501) (150,858)
Accumulated Impairment Charge (113,067) (113,067)
Carrying Value 116,472 123,115
Trade Names    
Finite-Lived intangible assets    
Cost 74,350 74,350
Accumulated Amortization (24,377) (23,754)
Accumulated Impairment Charge (23,232) (23,232)
Carrying Value $ 26,741 $ 27,364
Weighted Average Amortization Period 20 years 20 years
Customer relationships    
Finite-Lived intangible assets    
Cost $ 39,800 $ 39,800
Accumulated Amortization (22,366) (22,103)
Accumulated Impairment Charge (16,645) (16,645)
Carrying Value $ 789 $ 1,052
Weighted Average Amortization Period 12 years 12 years
Construction contract backlog    
Finite-Lived intangible assets    
Cost $ 149,290 $ 149,290
Accumulated Amortization (110,758) (105,001)
Carrying Value $ 38,532 $ 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)