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Condensed Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 6,508 $ 4,505
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 7,584 6,725
Deferred taxes 3,937 2,649
Stock options and restricted stock expense 686 450
Gain on disposal of assets 0 (702)
Changes in current assets and liabilities:    
Trade accounts receivables, net 1,070 499
Inventory, net 236 (1,265)
Prepaid income taxes and prepaid expenses (159) 1,755
Accounts payable and accrued liabilities 358 256
Current income tax liability 44 29
Deferred income 90 1,126
NET CASH PROVIDED BY OPERATING ACTIVITIES 20,354 16,027
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (6,319) (19,481)
Proceeds from sale of property and equipment 0 980
NET CASH USED IN INVESTING ACTIVITIES (6,319) (18,501)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from other long-term liabilities, net (10) 0
Proceeds from exercise of stock options 57 198
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES 47 198
NET CHANGE IN CASH AND CASH EQUIVALENTS 14,082 (2,276)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 16,390 19,137
CASH AND CASH EQUIVALENTS AT END OF PERIOD 30,472 16,861
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Interest paid 6 43
Income taxes paid 1  
NON-CASH TRANSACTIONS    
Transfer of rental equipment to inventory $ 8,690