Goodwill and Intangibles - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Amortized intangible assets:
Gross carrying amount		$ 4,900	$ 5,240
Accumulated amortization		(3,474)	(3,519)
Net intangible assets, excluding goodwill		1,426	1,721
Unamortized intangible assets:
Gross carrying amount		9,960	9,960
Net intangible assets, excluding goodwill		9,960	9,960
Gross carrying amount		14,860	15,200
Accumulated amortization		(3,474)	(3,519)
Total amortized and unamortized assets, excluding goodwill		11,386	11,681
Trade name
Unamortized intangible assets:
Gross carrying amount		9,960	9,960
Net intangible assets, excluding goodwill		9,960	9,960
Customer Relationships | ODR
Amortized intangible assets:
Gross carrying amount		4,710	4,710
Accumulated amortization		(3,396)	(3,112)
Net intangible assets, excluding goodwill		1,314	1,598
Unamortized intangible assets:
Accumulated amortization		(3,396)	(3,112)
Favorable Leasehold Interests
Amortized intangible assets:
Gross carrying amount		190	530
Accumulated amortization		(78)	(407)
Net intangible assets, excluding goodwill		112	123
Unamortized intangible assets:
Accumulated amortization		$ (78)	(407)
Reduction in gross carrying amount and accumulated amortization of intangibles due to lease termination	$ 300
Backlog – Construction
Amortized intangible assets:
Gross carrying amount			4,800
Accumulated amortization			(4,800)
Unamortized intangible assets:
Accumulated amortization			$ (4,800)