Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
OPERATING ACTIVITIES:
Net loss	$ (1,194)	$ (5,354)
Adjustments to reconcile net loss to net cash flows provided by (used in) operating activities:
Depreciation and amortization	45,692	47,747
Equity in earnings of joint ventures	(6,313)	(3,402)
Cash distributions from joint ventures	3,234	2,500
Deferred income taxes	152	(3,031)
(Gain) loss on sale of assets—net	675	(887)
Impairment of goodwill		2,750
Gain on adjustment of contingent consideration	(8,940)	(8,444)
Amortization of deferred financing fees	1,879	2,126
Unrealized net gain from mark-to-market valuations of derivatives	(5,285)	(1,479)
Unrealized foreign currency gain	(213)	(1,076)
Share-based compensation expense	2,276	2,897
Excess income tax benefit from share-based compensation		13
Changes in assets and liabilities:
Accounts receivable	14,163	(31,819)
Contract revenues in excess of billings	5,712	14,328
Inventories	(6,831)	(3,761)
Prepaid expenses and other current assets	(6,839)	(6,727)
Accounts payable and accrued expenses	(26,317)	(9,896)
Billings in excess of contract revenues	2,593	1,657
Other noncurrent assets and liabilities	(1,466)	(2,039)
Cash provided by (used in) operating activities	12,978	(3,897)
INVESTING ACTIVITIES:
Purchases of property and equipment	(58,842)	(53,394)
Proceeds from dispositions of property and equipment	10,455	1,167
Net cash flows used in investing activities	(48,387)	(52,227)
FINANCING ACTIVITIES:
Deferred financing fees	(332)	(29)
Repayments of long term note payable	(803)	(488)
Taxes paid on settlement of vested share awards	(162)	(265)
Repayments of term loan facility	(3,750)	(3,750)
Repayments of equipment debt	(1,064)	(853)
Proceeds from equipment debt		410
Exercise of options and purchases from employee stock plans	905	1,356
Excess income tax benefit from share-based compensation		(13)
Treasury stock		(1,107)
Borrowings under revolving loans	133,000	146,000
Repayments of revolving loans	(93,000)	(118,000)
Net cash provided by financing activities	34,794	23,261
Effect of foreign currency exchange rates on cash and cash equivalents	26	(105)
Net decrease in cash and cash equivalents	(589)	(32,968)
Cash and cash equivalents at beginning of period	14,184	42,389
Cash and cash equivalents at end of period	13,595	9,421
Supplemental Cash Flow Information
Cash paid for interest	23,846	23,645
Cash paid (refunded) for income taxes	(226)	987
Non-cash Investing and Financing Activities
Property and equipment purchased but not yet paid	$ 14,511	4,981
Property and equipment purchased on capital leases and equipment notes		2,190
Property and equipment purchased on notes payable		$ 15,569