Goodwill and Intangibles Assets - Definite-lived and Indefinite-lived Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Amortized intangible assets:
Gross carrying amount	$ 10,070	$ 10,070
Accumulated amortization	(8,349)	(7,719)
Total	1,721	2,351
Unamortized intangible assets:
Gross carrying amount	9,960	9,960
Total	9,960	9,960
Gross carrying amount	20,030	20,030
Accumulated amortization	(8,349)	(7,719)
Net intangible assets	11,681	12,311
Trade Name
Unamortized intangible assets:
Gross carrying amount	9,960	9,960
Total	9,960	9,960
Backlog – Construction
Amortized intangible assets:
Gross carrying amount	4,830	4,830
Accumulated amortization	(4,830)	(4,830)
Total	0	0
Unamortized intangible assets:
Accumulated amortization	(4,830)	(4,830)
Customer Relationships – Service
Amortized intangible assets:
Gross carrying amount	4,710	4,710
Accumulated amortization	(3,112)	(2,655)
Total	1,598	2,055
Unamortized intangible assets:
Accumulated amortization	(3,112)	(2,655)
Favorable Leasehold Interests
Amortized intangible assets:
Gross carrying amount	530	530
Accumulated amortization	(407)	(234)
Total	123	296
Unamortized intangible assets:
Accumulated amortization	$ (407)	$ (234)