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Condensed Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 6,241 $ 7,838
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 10,288 8,674
Deferred income taxes 86 4,067
Stock based compensation 1,638 598
Gain on disposal of assets (40) 0
Gain on extinguishment of liability 0 (223)
Changes in current assets and liabilities:    
Trade accounts receivables (363) 374
Inventory (1,453) 306
Prepaid expenses (936) (1,323)
Accounts payable and accrued liabilities 425 (1,479)
Current income tax liability 2,874 302
Deferred income (234) 285
Other (8) 0
Tax benefit from equity compensation (287) 0
NET CASH PROVIDED BY OPERATING ACTIVITIES 18,231 19,419
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (28,462) (18,429)
Proceeds from sale of property and equipment 40 0
NET CASH USED IN INVESTING ACTIVITIES (28,422) (18,429)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Repayments from other long-term liabilities, net (21) (64)
Repayments of line of credit (140) (50)
Proceeds from exercise of stock options 61 368
Tax benefit from equity compensation 287 0
NET CASH PROVIDED BY FINANCING ACTIVITIES 187 254
NET CHANGE IN CASH AND CASH EQUIVALENTS (10,004) 1,244
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 24,443 28,086
CASH AND CASH EQUIVALENTS AT END OF PERIOD 14,439 29,330
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Interest paid 5 42
Income taxes paid 981 1,801
NON-CASH TRANSACTIONS    
Transfer of rental equipment to inventory $ 53 $ 57