Condensed Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Contract revenues	$ 170,586	$ 163,119
Costs of contract revenues	154,404	143,129
Gross profit	16,182	19,990
General and administrative expenses	16,795	20,089
(Gain) loss on sale of assets—net	11	(10)
Operating loss	(624)	(89)
Interest expense—net	(5,582)	(5,721)
Equity in earnings (loss) of joint ventures	1	(115)
Other income (expense)	208	(763)
Loss from continuing operations before income taxes	(5,997)	(6,688)
Income tax benefit	2,274	2,653
Loss from continuing operations	(3,723)	(4,035)
Loss from discontinued operations, net of income taxes	(13,065)
Net loss	$ (16,788)	$ (4,035)
Basic loss per share attributable to continuing operations	$ (0.06)	$ (0.07)
Basic loss per share attributable to discontinued operations, net of tax	(0.21)
Basic loss per share	$ (0.27)	$ (0.07)
Basic weighted average shares	61,065	60,507
Diluted loss per share attributable to continuing operations	$ (0.06)	$ (0.07)
Diluted loss per share attributable to discontinued operations, net of tax	(0.21)
Diluted loss per share	$ (0.27)	$ (0.07)
Diluted weighted average shares	61,065	60,507