Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement
Contract revenues	$ 748,322	$ 601,360	$ 709,942
Costs of contract revenues	697,580	560,393	625,239
Gross profit	50,742	40,967	84,703
Selling, general and administrative expenses	62,503	60,181	65,091
Amortization of intangible assets	1,239	1,521	2,070
Gain on disposal of assets, net	(4,970)	(11,418)	(9,044)
Operating income (loss)	(8,030)	(9,317)	26,586
Other (expense) income:
Other income	199	199	347
Interest income	104	136	183
Interest expense	(4,456)	(5,076)	(4,920)
Other expense, net	(4,153)	(4,741)	(4,390)
Income (loss) income before income taxes	(12,183)	(14,058)	22,196
Income tax (benefit) expense	429	502	1,976
Net income (loss)	$ (12,612)	$ (14,560)	$ 20,220
Basic income (loss) per share (in dollars per share)	$ (0.40)	$ (0.47)	$ 0.67
Diluted income (loss) per share (in dollars per share)	$ (0.40)	$ (0.47)	$ 0.67
Shares used to compute income (loss) per share:
Basic (in shares)	31,402,328	30,763,527	30,122,362
Diluted (in shares)	31,402,328	30,763,527	30,122,362