Goodwill and Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Total Intangible Assets [Abstract]
Cost	$ 381,940	$ 387,040
Accumulated Amortization	(183,805)	(150,858)
Accumulated Impairment Charge	(113,067)	(113,067)
Carrying Value	85,068	123,115
Trade Names
Finite-Lived intangible assets
Cost	69,250	74,350
Accumulated Amortization	(23,650)	(23,754)
Accumulated Impairment Charge	(23,232)	(23,232)
Carrying Value	$ 22,368	$ 27,364
Weighted-Average Amortization Period	20 years	20 years
Customer relationships
Finite-Lived intangible assets
Cost	$ 39,800	$ 39,800
Accumulated Amortization	(23,053)	(22,103)
Accumulated Impairment Charge	(16,645)	(16,645)
Carrying Value	$ 102	$ 1,052
Weighted-Average Amortization Period	12 years	12 years
Construction contract backlog
Finite-Lived intangible assets
Cost	$ 149,290	$ 149,290
Accumulated Amortization	(137,102)	(105,001)
Carrying Value	$ 12,188	$ 44,289
Weighted-Average Amortization Period	3 years	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)