Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement
Contract revenues	$ 139,907	$ 189,433	$ 439,091	$ 539,766
Costs of contract revenues	133,329	166,932	404,757	476,763
Gross profit	6,578	22,501	34,334	63,003
Selling, general and administrative expenses	15,733	15,270	44,078	47,651
Amortization of intangible assets	380	519	1,141	1,552
Gain on disposal of assets, net	(792)	(6,373)	(9,763)	(7,734)
Operating income (loss)	(8,743)	13,085	(1,122)	21,534
Other (expense) income:
Other income	50	115	159	251
Interest income	22	57	73	151
Interest expense	(523)	(1,151)	(4,506)	(3,722)
Other expense, net	(451)	(979)	(4,274)	(3,320)
Income (loss) before income taxes	(9,194)	12,106	(5,396)	18,214
Income tax expense	1,001	303	341	1,660
Net income (loss)	$ (10,195)	$ 11,803	$ (5,737)	$ 16,554
Basic earnings (loss) per share (in dollars per share)	$ (0.33)	$ 0.39	$ (0.19)	$ 0.55
Diluted earnings (loss) per share (in dollars per share)	$ (0.33)	$ 0.39	$ (0.19)	$ 0.55
Shares used to compute income (loss) per share:
Basic (in shares)	30,979,207	30,372,310	30,707,426	30,020,258
Diluted (in shares)	30,979,207	30,372,310	30,707,426	30,020,258