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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 1,149 $ 5,309
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 15,958 16,371
Deferred income taxes (3,233) (1,773)
Stock-based compensation 3,231 1,739
Bad debt allowance 70 61
Inventory allowance 0 32
Gain on sale of assets (49) (49)
Gain on company owned life insurance (35) (7)
Changes in operating assets and liabilities:    
Trade accounts receivables 145 3,714
Inventory (2,535) 3,556
Prepaid expenses and prepaid income taxes (1,012) (604)
Accounts payable and accrued liabilities 1,927 (550)
Deferred income (2,040) 1,629
Other 578 133
Tax benefit from equity compensation 0 (51)
NET CASH PROVIDED BY OPERATING ACTIVITIES 14,154 29,510
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (4,662) (3,359)
Purchase of company owned life insurance (571) (142)
Proceeds from sale of property and equipment 49 49
NET CASH USED IN INVESTING ACTIVITIES (5,184) (3,452)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payments from other long-term liabilities, net (13) (8)
Proceeds from exercise of stock options 517 433
Taxes paid related to net share settlement of equity awards (644) (909)
Tax benefit from equity compensation 0 51
NET CASH USED IN FINANCING ACTIVITIES (140) (433)
NET CHANGE IN CASH AND CASH EQUIVALENTS 8,830 25,625
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 64,094 35,532
CASH AND CASH EQUIVALENTS AT END OF PERIOD 72,924 61,157
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Interest paid 11 6
Income taxes paid 4,288 4,795
NON-CASH TRANSACTIONS    
Transfer of rental equipment components to inventory $ 48 $ 164