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Condensed Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 3,994 $ 3,508
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 4,238 3,787
Deferred taxes 2,448 2,150
Stock based compensation 133 323
Gain on disposal of assets (1) 0
Gain on extinguishment of liability (223) 0
Changes in current assets and liabilities:    
Trade accounts receivables 1,261 2,575
Inventory 1,742 379
Prepaid income taxes and prepaid expenses 348 (174)
Accounts payable and accrued liabilities (1,928) (1,334)
Current income tax liability (516) 0
Deferred income (561) 3,627
NET CASH PROVIDED BY OPERATING ACTIVITIES 10,935 14,841
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (7,713) (1,787)
NET CASH USED IN INVESTING ACTIVITIES (7,713) (1,787)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from other long-term liabilities, net (57) (6)
Proceeds from exercise of stock options 30 0
NET CASH USED IN FINANCING ACTIVITIES (27) (6)
NET CHANGE IN CASH AND CASH EQUIVALENTS 3,195 13,048
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 28,086 16,390
CASH AND CASH EQUIVALENTS AT END OF PERIOD 31,281 29,438
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Interest paid 31 0
Income taxes paid 516 0
NON-CASH TRANSACTIONS    
Transfer of rental equipment to inventory $ 0 $ 4,010