Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Contract revenues	$ 125,073	$ 140,162	$ 421,682	$ 416,339
Costs of contract revenues	119,135	129,405	379,154	377,200
Gross profit	5,938	10,757	42,528	39,139
Selling, general and administrative expenses	14,371	16,524	46,249	49,031
Gain on sale of assets, net	(1,028)	(413)	(2,527)	(590)
Other gain from continuing operations	0	0	(5,448)	0
Operating (loss) income from operations	(7,405)	(5,354)	4,254	(9,302)
Other (expense) income
Other income	1,143	9	1,617	30
Interest income	52	11	100	11
Interest expense	(3,217)	(1,369)	(5,899)	(4,186)
Other expense, net	(2,022)	(1,349)	(4,182)	(4,145)
(Loss) income before income taxes	(9,427)	(6,703)	72	(13,447)
Income tax (benefit) expense	(3,071)	(1,666)	78	(4,309)
Net loss	$ (6,356)	$ (5,037)	$ (6)	$ (9,138)
Basic (loss) income per share (in dollars per share)	$ (0.22)	$ (0.18)	$ 0.00	$ (0.33)
Diluted (loss) income per share (in dollars per share)	$ (0.22)	$ (0.18)	$ 0.00	$ (0.33)
Shares used to compute loss per share:
Basic (in shares)	28,490,530	27,950,829	28,421,850	27,980,074
Diluted (in shares)	28,490,530	27,950,829	28,421,850	27,980,074