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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 3,800 $ 4,308
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 10,940 11,646
Deferred income taxes (770) (1,877)
Stock-based compensation 1,186 1,694
Bad debt allowance 61 371
Inventory allowance 32 70
Gain on sale of assets (25) (50)
Loss on retirement of rental equipment 0 4,373
Gain on company owned life insurance (4) 0
Changes in current assets and liabilities:    
Trade accounts receivables 4,034 594
Inventory 3,179 4,959
Prepaid expenses (1,532) 5,264
Accounts payable and accrued liabilities (1,430) (7,398)
Current income tax liability 0 2,436
Deferred income 286 (1,450)
Other 84 33
Tax benefit from equity compensation (39) 0
NET CASH PROVIDED BY OPERATING ACTIVITIES 19,802 24,973
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (2,618) (9,563)
Purchase of company owned life insurance (105) 0
Proceeds from sale of property and equipment 25 82
NET CASH USED IN INVESTING ACTIVITIES (2,698) (9,481)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payments from other long-term liabilities, net (6) (14)
Proceeds from exercise of stock options 406 550
Taxes paid related to net share settlement of equity awards (909) (677)
Tax benefit from equity compensation 39 0
NET CASH USED IN FINANCING ACTIVITIES (470) (141)
NET CHANGE IN CASH AND CASH EQUIVALENTS 16,634 15,351
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 35,532 6,181
CASH AND CASH EQUIVALENTS AT END OF PERIOD 52,166 21,532
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Interest paid 4 6
Income taxes paid 4,435 1,090
NON-CASH TRANSACTIONS    
Transfer of rental equipment components to inventory 164 969
Transfer from inventory to property and equipment $ 0 $ 1,319