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Condensed Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 10,124 $ 11,233
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 15,816 13,326
Deferred income taxes (226) 5,736
Stock based compensation 2,438 1,134
Inventory allowance 395 13
Gain on disposal of assets (159) 0
Gain on extinguishment of liability 0 (223)
Changes in current assets and liabilities:    
Trade accounts receivables (2,762) 1,314
Inventory (4,895) (1,049)
Prepaid expenses (3,024) (1,937)
Accounts payable and accrued liabilities 2,785 (735)
Current income tax liability 5,290 409
Deferred income 1,140 (824)
Other (11) 0
Tax benefit from equity compensation (414) 0
NET CASH PROVIDED BY OPERATING ACTIVITIES 26,497 28,397
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (46,388) (29,175)
Proceeds from sale of property and equipment 239 0
NET CASH USED IN INVESTING ACTIVITIES (46,149) (29,175)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Repayments from other long-term liabilities, net (33) (73)
Repayments of line of credit (160) (150)
Proceeds from exercise of stock options 61 642
Tax benefit from equity compensation 414 0
NET CASH PROVIDED BY FINANCING ACTIVITIES 282 419
NET CHANGE IN CASH AND CASH EQUIVALENTS (19,370) (359)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 24,443 28,086
CASH AND CASH EQUIVALENTS AT END OF PERIOD 5,073 27,727
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Interest paid 9 45
Income taxes paid 4,968 2,036
NON-CASH TRANSACTIONS    
Transfer of rental equipment to inventory $ 53 $ 207