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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash Flows From Operating Activities:    
Net income $ 9,506 $ 4,734
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 3,865 3,287
Provision for doubtful accounts 51 (404)
Amortization of debt issuance costs 158 489
Deferred income taxes 649 (388)
(Gain) loss on disposal of property and equipment (177) 132
Stock based compensation expense 526 579
Unrealized (gain) loss on foreign currency forward contracts (94) 169
Changes in operating assets and liabilities:    
Trade and other receivables, net (23,968) 5,427
Costs and estimated earnings in excess of billings on uncompleted contracts, net (390) (9,565)
Inventories 4,085 8,275
Prepaid expenses and other assets 387 601
Accounts payable 10,728 1,833
Deferred revenue (1,540) 1,099
Accrued and other liabilities 58 1,421
Net cash provided by operating activities 3,844 17,689
Cash Flows From Investing Activities:    
Additions to property and equipment (9,781) (4,437)
Proceeds from the sale of property and equipment 1,669 4
Issuance of notes receivable   (1,000)
Net cash used in investing activities (8,112) (5,433)
Cash Flows From Financing Activities:    
Tax withholdings related to net share settlements of restricted stock awards and performance shares (802) (145)
Payments on long-term debt (2,786) (2,786)
Borrowings under note payable to financial institution 37,471 25,150
Payments on note payable to financial institution (28,768) (33,343)
Payments on capital lease obligations (846) (857)
Payments of debt amendment costs   (369)
Net cash provided by (used in) financing activities 4,269 (12,350)
Change in cash and cash equivalents 1 (94)
Cash and cash equivalents, beginning of period 46 182
Cash and cash equivalents, end of period 47 88
Non-cash investing activity:    
Escrow account related to capital lease financing 898 897
Accrued property and equipment purchases $ 4,605 $ 1,036