Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Contract revenues	$ 138,757	$ 129,623
Costs of contract revenues	125,772	114,912
Gross profit	12,985	14,711
Selling, general and administrative expenses	14,979	15,538
(Gain) loss on sale of assets, net	(512)	(372)
Operating loss from operations	(1,482)	(455)
Other (expense) income
Other income	10	13
Interest income	0	1
Interest expense	(1,355)	(1,517)
Other expense, net	(1,345)	(1,503)
Loss before income taxes	(2,827)	(1,958)
Income tax benefit	(1,019)	(750)
Net loss	$ (1,808)	$ (1,208)
Basic income (loss) per share (in dollars per share)	$ (0.07)	$ (0.04)
Diluted income (loss) per share (in dollars per share)	$ (0.07)	$ (0.04)
Shares used to compute loss per share
Basic (in shares)	27,786,087	27,286,981
Diluted (in shares)	27,786,087	27,286,981