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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:      
Net income (loss) $ (923) $ 16,244 $ 12,660
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation and amortization of property and equipment 13,299 16,267 14,471
Impairment of fixed assets 27,500    
Amortization of intangible assets      50
Allowance on notes receivable     4,071
Provision for doubtful accounts (1,063) 98 (501)
Equity in earnings of unconsolidated subsidiary     394
Amortization of debt issuance costs 634 1,318 2,042
Loss on impairment 250    
Deferred income taxes (7,994) (4,120) 5,908
Loss on disposal of property and equipment 256 998 397
Gain on sale of business     (2,887)
Stock-based compensation expense 3,060 3,048 1,461
Tax (deficiency) benefit from stock compensation plans (1) 9 243
Unrealized loss (gain) on foreign currency forward contracts (195) 207 (327)
Changes in operating assets and liabilities, net of acquired assets and assumed liabilities      
Trade and other receivables (24,212) 28,298 (5,713)
Costs and estimated earnings in excess of billings on uncompleted contracts, net 19,736 (36,621) 510
Inventories 8,261 (5,582) (29,794)
Refundable income taxes (1,073)   15,099
Prepaid expenses and other 307 5,480 (5,297)
Accounts payable 1,374 (310) (8,920)
Deferred revenue (3,901) 7,764 1,029
Accrued and other liabilities (15,226) 11,392 7,379
Net cash provided by operating activities 20,089 44,490 12,275
Cash flows from investing activities:      
Acquisition of businesses, net of cash acquired (15,689)    
Additions to property and equipment (28,447) (16,789) (16,333)
Proceeds from sale of business     13,727
Proceeds from sale of property and equipment 1,711 1,072 96
Issuance of notes receivable (5,700) (1,000)  
Restricted cash   (2,640) 2,640
Other investing activities (126) 60 800
Net cash (used in) provided by investing activities (48,251) (19,297) 930
Cash flows from financing activities:      
Proceeds from sale of common stock 72 37 147
Tax withholdings related to net share settlements of restricted share awards and performance shares (802) (212) (80)
Payments on long-term debt (5,714) (5,714) (5,714)
Borrowings under note payable to financial institutions 220,721 119,000 132,050
Payments on note payable to financial institutions (180,334) (133,468) (138,050)
Payments of debt issuance costs   (1,599)  
Borrowings from capital lease obligations     1,829
Payments on capital lease obligations (5,239) (3,373) (3,256)
Net cash provided by (used in) financing activities 28,704 (25,329) (13,074)
Change in cash and cash equivalents 542 (136) 131
Cash and cash equivalents, beginning of period 46 182 51
Cash and cash equivalents, end of period 588 46 182
Supplemental disclosure of cash flow information:      
Cash paid during the period for interest, net of amounts capitalized 3,277 4,353 7,220
Cash paid (refunded) during the period for income taxes (net of (refunds) payments of ($311), ($1,834), and $2,292) 9,592 5,007 (12,960)
Non-cash investing and financing activities:      
Escrow account related to capital lease financing   898 897
Accrued property and equipment purchases 1,656 2,777 1,673
Capital lease additions   $ 142