Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
OPERATING ACTIVITIES:
Net loss	$ (16,788)	$ (4,035)
Loss from discontinued operations, net of income taxes	(13,065)
Loss from continuing operations	(3,723)	(4,035)
Adjustments to reconcile net loss to net cash flows provided by (used in) operating activities:
Depreciation and amortization	14,571	13,928
Equity in earnings of joint ventures	(3,067)	(419)
Cash distributions from joint ventures	2,046
Deferred income taxes	(2,306)	(2,108)
(Gain) loss on sale of assets—net	11	(10)
Amortization of deferred financing fees	825	623
Unrealized net (gain) loss from mark-to-market valuations of derivatives	1,548	(1,332)
Unrealized foreign currency gain	(76)	(77)
Share-based compensation expense	918	927
Changes in assets and liabilities:
Accounts receivable	(3,234)	29,748
Contract revenues in excess of billings	19,362	6,748
Inventories	(609)	(2,603)
Prepaid expenses and other current assets	(7,392)	(3,418)
Accounts payable and accrued expenses	(27,610)	(33,322)
Billings in excess of contract revenues	3,931	(910)
Other noncurrent assets and liabilities	(255)	(780)
Cash provided by (used in) operating activities	(5,060)	2,960
INVESTING ACTIVITIES:
Purchases of property and equipment	(17,452)	(14,917)
Proceeds from dispositions of property and equipment	265	25
Changes in restricted cash	7,035
Net cash flows used in investing activities	(10,152)	(14,892)
FINANCING ACTIVITIES:
Deferred financing fees	(58)
Repayments of long term note payable	(283)	(265)
Taxes paid on settlement of vested share awards	(164)
Repayments of term loan facility		(1,250)
Repayments of equipment debt	(376)	(367)
Exercise of options and purchases from employee stock plans	434	415
Borrowings under revolving loans	28,112	38,000
Repayments of revolving loans	(16,723)	(23,000)
Cash provided by financing activities	10,942	13,533
Effect of foreign currency exchange rates on cash and cash equivalents	(2)	109
Net increase (decrease) in cash and cash equivalents	(4,272)	1,710
Cash and cash equivalents at beginning of period	11,167	14,184
Cash and cash equivalents at end of period	6,895	15,894
Supplemental Cash Flow Information
Cash paid for interest	11,473	11,276
Cash paid (refunded) for income taxes	89	(1)
Non-cash Investing and Financing Activities
Property and equipment purchased but not yet paid	$ 2,187	$ 10,003