Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement
Contract revenues	$ 601,360	$ 709,942	$ 708,390
Costs of contract revenues	560,393	625,239	644,349
Gross profit	40,967	84,703	64,041
Selling, general and administrative expenses	60,181	65,091	61,012
Amortization of intangible assets	1,521	2,070	2,640
Gain on disposal of assets, net	(11,418)	(9,044)	(1,804)
Operating (loss) income	(9,317)	26,586	2,193
Other (expense) income:
Other income	199	347	771
Interest income	136	183	353
Interest expense	(5,076)	(4,920)	(6,808)
Other expense, net	(4,741)	(4,390)	(5,684)
(Loss) income before income taxes	(14,058)	22,196	(3,491)
Income tax expense	502	1,976	1,868
Net (loss) income	$ (14,560)	$ 20,220	$ (5,359)
Basic (loss) earnings per share (in dollars per share)	$ (0.47)	$ 0.67	$ (0.18)
Diluted (loss) earnings per share (in dollars per share)	$ (0.47)	$ 0.67	$ (0.18)
Shares used to compute (loss) income per share:
Basic (in shares)	30,763,527	30,122,362	29,322,054
Diluted (in shares)	30,763,527	30,122,362	29,322,054