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Condensed Statements of Cash Flows (USD $)
In Thousands
 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 4,505 $ 2,908
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 6,725 5,779
Deferred taxes 2,649 863
Stock options and restricted stock expense 450 592
Gain on disposal of assets (702) (36)
Changes in current assets and liabilities:    
Trade accounts receivables, net 499 4,100
Inventory, net (1,265) 946
Prepaid income taxes and prepaid expenses 1,755 (1,186)
Accounts payable and accrued liabilities 256 144
Current income tax liability 29 767
Deferred income 1,126 82
Other   (7)
NET CASH PROVIDED BY OPERATING ACTIVITIES 16,027 14,952
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (19,481) (6,030)
Proceeds from sale of property and equipment 980 36
NET CASH USED IN INVESTING ACTIVITIES (18,501) (5,994)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from other long-term liabilities, net 0 (7)
Repayments of long-term debt 0 (1,690)
Repayments of line of credit 0 (6,500)
Proceeds from exercise of stock options 198 53
NET CASH PROVIDED BY FINANCING ACTIVITIES 198 (8,144)
NET CHANGE IN CASH (2,276) 814
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 19,137 23,017
CASH AND CASH EQUIVALENTS AT END OF PERIOD 16,861 23,831
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Interest paid 43 157
Income taxes paid 0 1,118
NON-CASH TRANSACTIONS    
Transfer of rental equipment to inventory $ 0 $ 225