Condensed Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Contract revenues	$ 192,192	$ 238,877	$ 355,311	$ 413,434
Costs of contract revenues	167,936	206,590	311,065	370,465
Gross profit	24,256	32,287	44,246	42,969
General and administrative expenses	19,751	15,543	39,840	33,491
Impairment of goodwill		2,750		2,750
(Gain) loss on sale of assets—net	687	5	677	(3)
Operating income	3,818	13,989	3,729	6,731
Interest expense—net	(5,903)	(5,567)	(11,624)	(11,197)
Equity in earnings (loss) of joint ventures	128	(2,616)	13	(3,714)
Other expense	(518)	(618)	(1,281)	(1,059)
Income (loss) before income taxes	(2,475)	5,188	(9,163)	(9,239)
Income tax (provision) benefit	756	(2,464)	3,409	3,573
Net income (loss)	$ (1,719)	$ 2,724	$ (5,754)	$ (5,666)
Basic earnings (loss) per share	$ (0.03)	$ 0.05	$ (0.10)	$ (0.09)
Basic weighted average shares	60,711	60,473	60,609	60,369
Diluted earnings (loss) per share	$ (0.03)	$ 0.05	$ (0.10)	$ (0.09)
Diluted weighted average shares	60,711	60,924	60,609	60,369