Condensed Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Contract revenues	$ 198,869	$ 220,802	$ 554,180	$ 634,236
Costs of contract revenues	178,824	196,717	489,889	567,182
Gross profit	20,045	24,085	64,291	67,054
General and administrative expenses	7,187	15,277	47,027	48,768
Impairment of goodwill				2,750
(Gain) loss on sale of assets—net	(2)	(884)	675	(887)
Operating income	12,860	9,692	16,589	16,423
Interest expense—net	(4,819)	(7,293)	(16,443)	(18,490)
Equity in earnings (loss) of joint ventures	6	(2,051)	19	(5,765)
Other income (expense)	(637)	706	(1,918)	(353)
Income (loss) before income taxes	7,410	1,054	(1,753)	(8,185)
Income tax (provision) benefit	(2,850)	(742)	559	2,831
Net income (loss)	$ 4,560	$ 312	$ (1,194)	$ (5,354)
Basic earnings (loss) per share	$ 0.08		$ (0.02)	$ (0.09)
Basic weighted average shares	60,811	60,496	60,676	60,411
Diluted earnings (loss) per share	$ 0.08		$ (0.02)	$ (0.09)
Diluted weighted average shares	61,526	60,841	60,676	60,411