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Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 6,870 $ 10,124
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 17,240 15,816
Deferred income taxes (2,629) (226)
Stock based compensation 2,616 2,438
Bad debt allowance 402 0
Inventory allowance 70 395
Gain on sale of assets (81) (159)
Loss on retirement of rental equipment 4,370 0
Changes in current assets and liabilities:    
Trade accounts receivables 2,449 (2,762)
Inventory 3,912 (4,895)
Prepaid expenses 2,287 (3,024)
Accounts payable and accrued liabilities (7,107) 2,785
Current income tax liability 5,086 5,290
Deferred income (646) 1,140
Other (19) (11)
Tax benefit from equity compensation 0 (414)
NET CASH PROVIDED BY OPERATING ACTIVITIES 34,820 26,497
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (11,163) (46,388)
Proceeds from sale of property and equipment 113 239
NET CASH USED IN INVESTING ACTIVITIES (11,050) (46,149)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payments from other long-term liabilities, net (20) (33)
Repayments of line of credit, net 0 (160)
Proceeds from exercise of stock options 733 61
Taxes paid related to net share settlement of equity awards (686) 0
Tax benefit from equity compensation 0 414
NET CASH PROVIDED BY FINANCING ACTIVITIES 27 282
NET CHANGE IN CASH AND CASH EQUIVALENTS 23,797 (19,370)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 6,181 24,443
CASH AND CASH EQUIVALENTS AT END OF PERIOD 29,978 5,073
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Interest paid 13 9
Income taxes paid 3,185 4,968
NON-CASH TRANSACTIONS    
Transfer of rental equipment components to inventory 1,065 0
Transfer from inventory to property and equipment $ 1,622 $ 53