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Condensed Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 11,233 $ 9,114
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 13,326 11,564
Deferred income taxes 5,736 5,627
Stock based compensation 1,134 1,058
Gain on extinguishment of liability (223) 0
Changes in current assets and liabilities:    
Trade accounts receivables 1,314 1,948
Inventory (1,036) 312
Prepaid expenses (1,937) (178)
Accounts payable and accrued liabilities (735) 3,460
Current income tax liability 409 0
Deferred income (824) (1,359)
NET CASH PROVIDED BY OPERATING ACTIVITIES 28,397 31,546
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (29,175) (17,074)
NET CASH USED IN INVESTING ACTIVITIES (29,175) (17,074)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from other long-term liabilities, net (73) (16)
Repayments of line of credit (150) (90)
Proceeds from exercise of stock options 642 168
NET CASH PROVIDED BY FINANCING ACTIVITIES 419 62
NET CHANGE IN CASH AND CASH EQUIVALENTS (359) 14,534
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 28,086 16,390
CASH AND CASH EQUIVALENTS AT END OF PERIOD 27,727 30,924
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Interest paid 45 13
Income taxes paid 2,036 0
NON-CASH TRANSACTIONS    
Transfer of rental equipment to inventory $ 207 $ 8,690