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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash Flows From Operating Activities:    
Net income $ 15,067 $ 8,338
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 7,195 7,459
Provision for doubtful accounts (656) (452)
Amortization of debt issuance costs 317 936
Deferred income taxes 765 610
Loss on disposal of property and equipment 26 14
Stock based compensation expense 1,292 1,275
Unrealized (gain) loss on foreign currency forward contracts (291) 86
Changes in operating assets and liabilities:    
Trade and other receivables, net (15,792) (1,883)
Costs and estimated earnings in excess of billings on uncompleted contracts, net 4,784 (14,630)
Inventories (2,027) (13,285)
Prepaid expenses and other assets 1,040 3,727
Accounts payable 9,710 10,394
Deferred revenue (2,877) 5,076
Accrued and other liabilities (5,364) 16,761
Net cash provided by operating activities 13,189 24,426
Cash Flows From Investing Activities:    
Additions to property and equipment (18,394) (8,013)
Proceeds from the sale of property and equipment 1,680 959
Issuance of notes receivable (2,850) (1,000)
Net cash used in investing activities (19,564) (8,054)
Cash Flows From Financing Activities:    
Proceeds from Issuance of Common Stock 72 37
Tax withholdings related to net share settlements of restricted stock units and performance share awards (802) (145)
Payments on long-term debt (4,286) (4,286)
Borrowings under note payable to financial institution 85,971 71,800
Payments on note payable to financial institution (72,754) (81,800)
Payments on capital lease obligations (1,678) (1,734)
Payments of debt amendment costs   (401)
Net cash provided by (used in) financing activities 6,523 (16,529)
Change in cash and cash equivalents 148 (157)
Cash and cash equivalents, beginning of period 46 182
Cash and cash equivalents, end of period 194 25
Non-cash investing activity:    
Escrow account related to capital lease financing 898 897
Accrued property and equipment purchases 1,553 1,716
Capital lease additions   $ 142