Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
OPERATING ACTIVITIES:
Net income	$ 5,299	$ 4,566
Adjustments to reconcile net income to net cash flows used in operating activities:
Depreciation and amortization	16,123	18,804
Equity in loss of joint ventures	24	714
Loss on extinguishment of 7 3/4% senior subordinated notes		5,145
Deferred income taxes	(478)	1,010
Gain on dispositions of property and equipment	(124)	(2,771)
Gain on adjustment of contingent earnout	(240)
Amortization of deferred financing fees	669	775
Unrealized foreign currency gain	378
Share-based compensation expense	1,714	843
Excess income tax benefit from share based compensation	(118)	(52)
Changes in assets and liabilities:
Accounts receivable	4,301	(13,025)
Contract revenues in excess of billings	(22,288)	(2,278)
Inventories	(8,653)	(362)
Prepaid expenses and other current assets	(5,873)	(12,432)
Accounts payable and accrued expenses	(11,771)	(5,523)
Billings in excess of contract revenues	6,371	(2,165)
Other noncurrent assets and liabilities	(519)	(3,694)
Net cash flows used in operating activities	(15,185)	(10,445)
INVESTING ACTIVITIES:
Purchases of property and equipment	(22,428)	(13,583)
Proceeds from dispositions of property and equipment	226	7,275
Net cash flows used in investing activities	(22,202)	(6,308)
FINANCING ACTIVITIES:
Proceeds from issuance of 7 3/8% senior notes		250,000
Redemption of 7 3/4% senior subordinated notes		(175,000)
Senior subordinated notes redemption premium		(2,264)
Deferred financing fees	(2,039)	(5,829)
Distribution made to member or limited partner, cash distributions paid	(133)
Dividends paid	(2,482)	(2,236)
Dividend equivalents paid on restricted stock units	(22)	(11)
Taxes paid on settlement of vested share awards	(212)	(250)
Repayments of equipment debt	(426)	(217)
Exercise of stock options	75	27
Excess income tax benefit from share-based compensation	118	52
Net cash flows provided by (used in) financing activities	(5,121)	64,272
Effect of foreign currency exchange rates on cash and cash equivalents	11
Net increase (decrease) in cash and cash equivalents	(42,497)	47,519
Cash and cash equivalents at beginning of period	113,288	48,478
Cash and cash equivalents at end of period	70,791	95,997
Supplemental Cash Flow Information
Cash paid for interest	9,602	2,728
Cash paid (refunded) for income taxes	(6,371)	5,155
Non-cash Investing and Financing Activities
Property and equipment purchased but not yet paid	6,231	4,303
Acquisition of noncontrolling interest in NASDI, LLC		$ 40