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Goodwill and Intangible Assets (Intangible Assets) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Total intangible assets    
Cost $ 381,940 $ 381,940
Accumulated Amortization (198,890) (198,331)
Accumulated Impairment Charge (113,067) (113,067)
Carrying Value 69,983 70,542
Trade Names    
Finite-Lived intangible assets    
Cost 69,250 69,250
Accumulated Amortization (26,445) (25,886)
Accumulated Impairment Charge (23,232) (23,232)
Carrying Value $ 19,573 $ 20,132
Weighted-Average Amortization Period 20 years 20 years
Customer relationships    
Finite-Lived intangible assets    
Cost $ 39,800 $ 39,800
Accumulated Amortization (23,155) (23,155)
Accumulated Impairment Charge (16,645) (16,645)
Carrying Value 0 0
Construction contract backlog    
Finite-Lived intangible assets    
Cost 149,290 149,290
Accumulated Amortization (149,290) (149,290)
Carrying Value 0 0
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)
Finite-Lived intangible assets    
Carrying Value $ 0 $ 0