Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
OPERATING ACTIVITIES:
Net loss	$ (4,035)	$ (8,390)
Adjustments to reconcile net loss to net cash flows provided by (used in) operating activities:
Depreciation and amortization	13,928	13,153
Equity in (earnings) loss of joint ventures	(419)	1,098
Deferred income taxes	(2,108)	(6,045)
Gain on sale of assets	(10)	(8)
Amortization of deferred financing fees	623	492
Unrealized net gain from mark-to-market valuations of derivatives	(1,332)	(1,051)
Unrealized foreign currency gain	(77)	(736)
Share-based compensation expense	927	1,057
Excess income tax benefit from share-based compensation		(8)
Changes in assets and liabilities:
Accounts receivable	29,748	37,746
Contract revenues in excess of billings	6,748	(20,160)
Inventories	(2,603)	1,572
Prepaid expenses and other current assets	(3,418)	(1,114)
Accounts payable and accrued expenses	(33,322)	(24,463)
Billings in excess of contract revenues	(910)	(2,245)
Other noncurrent assets and liabilities	(780)	(1,475)
Cash provided by (used in) operating activities	2,960	(10,577)
INVESTING ACTIVITIES:
Purchases of property and equipment	(14,917)	(20,777)
Proceeds from dispositions of property and equipment	25	40
Net cash flows used in investing activities	(14,892)	(20,737)
FINANCING ACTIVITIES:
Deferred financing fees		(29)
Repayments of long term note payable	(265)
Taxes paid on settlement of vested share awards		(13)
Repayments of term loan facility	(1,250)	(1,250)
Repayments of equipment debt	(367)	(214)
Proceeds from equipment debt		408
Exercise of options and purchases from employee stock plans	415	736
Excess income tax benefit from share-based compensation		8
Borrowings under revolving loans	38,000	53,000
Repayments of revolving loans	(23,000)	(33,000)
Net cash provided by financing activities	13,533	19,646
Effect of foreign currency exchange rates on cash and cash equivalents	109	(102)
Net increase (decrease) in cash and cash equivalents	1,710	(11,770)
Cash and cash equivalents at beginning of period	14,184	42,389
Cash and cash equivalents at end of period	15,894	30,619
Supplemental Cash Flow Information
Cash paid for interest	11,276	11,068
Cash paid (refunded) for income taxes	(1)	368
Non-cash Investing and Financing Activities
Property and equipment purchased but not yet paid	$ 10,003	7,301
Property and equipment purchased on notes payable		$ 15,569