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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities:      
Net income (loss) $ 16,244 $ 12,660 $ (5,440)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:      
Depreciation and amortization of property and equipment 16,267 14,471 13,680
Amortization of intangible assets   50 185
Allowance on notes receivable   4,071  
Provision for doubtful accounts 98 (501) 1,358
Equity in earnings of unconsolidated subsidiary, net of dividends received of $600 in 2010   394 477
Amortization of debt issuance costs 1,318 2,042 1,418
Deferred income taxes (4,120) 5,908 9,292
Loss (gain) on disposal of property and equipment 998 397 (667)
Gain on sale of business   (2,887)  
Stock-based compensation expense 3,048 1,461 797
Tax benefit from stock compensation plans 9 243  
Unrealized loss (gain) on foreign currency forward contracts 207 (327) (431)
Changes in operating assets and liabilities:      
Trade and other receivables 28,298 (5,713) (28,818)
Costs and estimated earnings in excess of billings on uncompleted contracts, net (36,621) 510 (2,886)
Inventories (5,582) (29,794) (4,186)
Refundable income taxes   15,099 (8,070)
Prepaid expenses and other 5,480 (5,297) (292)
Accounts payable (310) (8,920) 1,160
Deferred revenue 7,764 1,029  
Accrued and other liabilities 11,392 7,379 1,079
Net cash provided by (used in) operating activities 44,490 12,275 (21,344)
Cash flows from investing activities:      
Additions to property and equipment (16,789) (16,333) (18,597)
Proceeds from sale of business   13,727  
Proceeds from sale of property and equipment 1,072 96 19
Issuance of notes receivable (1,000)   (550)
Insurance proceeds     587
Restricted cash (2,640) 2,640  
Other investing activities 60 800  
Net cash (used in) provided by investing activities (19,297) 930 (18,541)
Cash flows from financing activities:      
Proceeds from sale of common stock 37 147  
Tax withholdings related to net share settlements of restricted share awards and performance shares (212) (80) (87)
Payments on long-term debt (5,714) (5,714) (5,714)
Borrowings under note payable to financial institutions 119,000 132,050 181,375
Payments on note payable to financial institutions (133,468) (138,050) (132,778)
Payments of debt issuance costs (1,599)   (3,381)
Borrowings from capital lease obligations   1,829 2,865
Payments on capital lease obligations (3,373) (3,256) (2,375)
Net cash (used in) provided by financing activities (25,329) (13,074) 39,905
Change in cash and cash equivalents (136) 131 20
Cash and cash equivalents, beginning of period 182 51 31
Cash and cash equivalents, end of period 46 182 51
Supplemental disclosure of cash flow information:      
Cash paid during the period for interest, net of amounts capitalized 4,353 7,220 8,376
Cash paid (refunded) during the period for income taxes (net of (refunds) payments of ($1,834), $2,292 and $413) 5,007 (12,960) (2,769)
Non-cash investing and financing activities:      
Escrow account related to capital lease financing 898 897 2,726
Accrued property and equipment purchases 2,777 1,673 968
Capital lease refinancing     481
Capital lease additions $ 142