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Condensed Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 7,838 $ 6,508
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 8,674 7,584
Deferred taxes 4,067 3,937
Stock based compensation 598 686
Gain on extinguishment of liability (223) 0
Changes in current assets and liabilities:    
Trade accounts receivables 374 1,070
Inventory 306 236
Prepaid income taxes and prepaid expenses (1,323) (159)
Accounts payable and accrued liabilities (1,479) 358
Current income tax liability 302 44
Deferred income 285 90
NET CASH PROVIDED BY OPERATING ACTIVITIES 19,419 20,354
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (18,429) (6,319)
NET CASH USED IN INVESTING ACTIVITIES (18,429) (6,319)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from other long-term liabilities, net (64) (10)
Repayments of line of credit (50) 0
Proceeds from exercise of stock options 368 57
NET CASH PROVIDED BY FINANCING ACTIVITIES 254 47
NET CHANGE IN CASH AND CASH EQUIVALENTS 1,244 14,082
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 28,086 16,390
CASH AND CASH EQUIVALENTS AT END OF PERIOD 29,330 30,472
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Interest paid 42 6
Income taxes paid 1,801 1
NON-CASH TRANSACTIONS    
Transfer of rental equipment to inventory $ 57 $ 8,690