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Goodwill and Intangible Assets (Intangible Assets) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Total intangible assets    
Cost $ 387,040 $ 387,040
Accumulated Amortization (142,582) (118,703)
Accumulated Impairment Charge (113,067) (113,067)
Carrying Value 131,391 155,270
Trade Names    
Finite-Lived intangible assets    
Cost 74,350 74,350
Accumulated Amortization (23,133) (21,267)
Accumulated Impairment Charge (23,232) (23,232)
Carrying Value $ 27,985 $ 29,851
Weighted Average Amortization Period 20 years 20 years
Customer relationships    
Finite-Lived intangible assets    
Cost $ 39,800 $ 39,800
Accumulated Amortization (21,839) (21,048)
Accumulated Impairment Charge (16,645) (16,645)
Carrying Value $ 1,316 $ 2,107
Weighted Average Amortization Period 12 years 12 years
Construction contract backlog    
Finite-Lived intangible assets    
Cost $ 149,290 $ 149,290
Accumulated Amortization (97,610) (76,388)
Carrying Value $ 51,680 $ 72,902
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)