Goodwill and Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Total Intangible Assets [Abstract]
Cost	$ 381,940	$ 381,940
Accumulated Amortization	(198,331)	(183,805)
Accumulated Impairment Charge	(113,067)	(113,067)
Carrying Value	70,542	85,068
Trade Names
Finite-Lived intangible assets
Cost	69,250	69,250
Accumulated Amortization	(25,886)	(23,650)
Accumulated Impairment Charge	(23,232)	(23,232)
Carrying Value	$ 20,132	$ 22,368
Weighted-Average Amortization Period	20 years	20 years
Customer relationships
Finite-Lived intangible assets
Cost	$ 39,800	$ 39,800
Accumulated Amortization	(23,155)	(23,053)
Accumulated Impairment Charge	(16,645)	(16,645)
Carrying Value	0	$ 102
Weighted-Average Amortization Period		12 years
Construction contract backlog
Finite-Lived intangible assets
Cost	149,290	$ 149,290
Accumulated Amortization	(149,290)	(137,102)
Carrying Value	0	$ 12,188
Weighted-Average Amortization Period		3 years
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Trade Names
Finite-Lived intangible assets
Cost		$ 5,100
Carrying Value		2,600
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)