Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
CONTRACT REVENUES	$ 702,503	$ 767,585	$ 856,878
COSTS OF CONTRACT REVENUES	652,620	681,197	760,955
GROSS PROFIT	49,883	86,388	95,923
OPERATING EXPENSES:
GENERAL AND ADMINISTRATIVE EXPENSES	68,331	65,533	71,069
IMPAIRMENT OF GOODWILL	0		2,750
(GAIN) LOSS ON SALE OF ASSETS—Net	5,077	6,175	(855)
Total operating income (loss)	(23,525)	14,680	22,959
OTHER EXPENSE:
Interest expense—net	(26,046)	(22,907)	(24,365)
Equity in loss of joint ventures	(1,484)	(2,365)	(6,051)
Loss on extinguishment of debt	(2,330)
Other expense	(788)	(3,377)	(1,229)
Total other expense	(30,648)	(28,649)	(31,645)
LOSS FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(54,173)	(13,969)	(8,686)
INCOME TAX BENEFIT	35,610	5,792	2,497
LOSS FROM CONTINUING OPERATIONS	(18,563)	(8,177)	(6,189)
Loss from discontinued operations, net of income taxes	(12,697)
NET LOSS	$ (31,260)	$ (8,177)	$ (6,189)
Basic loss per share attributable to loss from continuing operations	$ (0.30)	$ (0.13)	$ (0.10)
Basic loss per share attributable to loss on discontinued operations, net of income taxes	(0.21)
Basic loss per share	$ (0.51)	$ (0.13)	$ (0.10)
Basic weighted average shares	61,365	60,744	60,410
Diluted loss per share attributable to loss from continuing operations	$ (0.30)	$ (0.13)	$ (0.10)
Diluted loss per share attributable to loss on discontinued operations, net of income taxes	(0.21)
Diluted loss per share	$ (0.51)	$ (0.13)	$ (0.10)
Diluted weighted average shares	61,365	60,744	60,410