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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income $ 19,851 $ 6,469 $ 10,147
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 21,302 21,796 22,758
Deferred taxes (21,582) (2,713) (1,846)
Gain on disposal of assets (87) (86) (179)
Loss on retirement of rental equipment 0 545 4,370
Bad debt allowance 90 61 477
Inventory allowance 273 566 205
Stock based compensation 4,038 2,299 3,545
Gain on company owned life insurance (67) (14) 0
Changes in assets (increase) decrease in:      
Trade accounts receivables (1,246) 1,668 824
Inventory (5,350) 1,131 5,337
Prepaid income taxes and prepaid expenses (1,806) (1,539) 5,774
Changes in liabilities increase (decrease) in:      
Accounts payable and accrued liabilities 3,410 (439) (7,220)
Current income tax liability 0 0 (1,230)
Deferred income (2,040) 1,954 (1,364)
Other 666 159 (32)
Tax benefit from equity compensation 0 (72) 0
NET CASH PROVIDED BY OPERATING ACTIVITIES 17,452 31,785 41,566
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchases of rental, property and equipment (13,489) (3,321) (12,459)
Purchase of company owned life insurance (620) (194) 0
Proceeds from Insurance Settlement, Investing Activities 1,231 0 0
Proceeds from sale of property and equipment 87 101 189
NET CASH USED IN INVESTING ACTIVITIES (12,791) (3,414) (12,270)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Payments of other long-term liabilities (23) (14) (26)
Proceeds from exercise of stock options 1,120 1,042 776
Tax benefit from equity compensation 0 72 0
Taxes paid related to net share settlement of equity awards (644) (909) (695)
NET CASH PROVIDED BY FINANCING ACTIVITIES 453 191 55
NET CHANGE IN CASH AND CASH EQUIVALENTS 5,114 28,562 29,351
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 64,094 35,532 6,181
CASH AND CASH EQUIVALENTS AT END OF PERIOD 69,208 64,094 35,532
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:      
Interest paid 14 8 15
Income taxes paid 3,725 5,825 6,530
NON-CASH TRANSACTIONS      
Transfer of rental equipment to inventory 55 724 2,309
Transfer of inventory to property and equipment $ 0 $ 0 $ 1,624