Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement
Contract revenues	$ 183,713	$ 165,985	$ 350,333	$ 309,090
Costs of contract revenues	162,969	151,008	309,831	285,031
Gross profit	20,744	14,977	40,502	24,059
Selling, general and administrative expenses	16,512	15,114	32,381	30,087
Amortization of intangible assets	517	658	1,033	1,318
Gain on sale of assets, net	(369)	(372)	(1,361)	(746)
Operating income (loss)	4,084	(423)	8,449	(6,600)
Other (expense) income:
Other income	39	534	136	557
Interest income	54	94	94	242
Interest expense	(1,169)	(1,978)	(2,571)	(3,303)
Other expense, net	(1,076)	(1,350)	(2,341)	(2,504)
Income (loss) before income taxes	3,008	(1,773)	6,108	(9,104)
Income tax expense (benefit)	980	(140)	1,357	453
Net income (loss)	$ 2,028	$ (1,633)	$ 4,751	$ (9,557)
Basic earnings (loss) per share (in dollars per share)	$ 0.07	$ (0.06)	$ 0.16	$ (0.33)
Diluted earnings (loss) per share (in dollars per share)	$ 0.07	$ (0.06)	$ 0.16	$ (0.33)
Shares used to compute income (loss) per share:
Basic (in shares)	30,031,188	29,097,094	29,842,298	29,086,811
Diluted (in shares)	30,031,188	29,097,094	29,842,298	29,086,811