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Goodwill And Intangible Assets (Intangible Assets) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Total intangible assets    
Cost $ 387,040 $ 387,040
Accumulated Amortization (133,299) (118,703)
Accumulated Impairment Charge (113,067) (113,067)
Carrying Value 140,674 155,270
Trade Names [Member]    
Finite-Lived intangible assets    
Cost 74,350 74,350
Accumulated Amortization (22,511) (21,267)
Accumulated impairment charge (23,232) (23,232)
Carrying Value $ 28,607 $ 29,851
Weighted Average Amortization Period 20 years 20 years
Customer Relationships [Member]    
Finite-Lived intangible assets    
Cost $ 39,800 $ 39,800
Accumulated Amortization (21,575) (21,048)
Accumulated impairment charge (16,645) (16,645)
Carrying Value $ 1,580 $ 2,107
Weighted Average Amortization Period 12 years 12 years
Construction Contract Backlog [Member]    
Finite-Lived intangible assets    
Cost $ 149,290 $ 149,290
Accumulated Amortization (89,213) (76,388)
Carrying Value $ 60,077 $ 72,902
Weighted Average Amortization Period 3 years 3 years
Trade Names [Member]    
Indefinite-lived intangible assets    
Cost $ 117,600 $ 117,600
Accumulated impairment charge (67,190) (67,190)
Carrying Value 50,410 50,410
Contractor License [Member]    
Indefinite-lived intangible assets    
Cost 6,000 6,000
Accumulated impairment charge $ (6,000) $ (6,000)