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Interim Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Operating Activities    
Net income $ 24,483 $ 19,221
Adjustment to reconcile net income to net cash used in operating activities:    
Provision for doubtful accounts (87) 172
Depreciation - PP&E 5,560 5,712
Depreciation - Rental 2,804 3,443
Amortization of intangibles 1,554 1,549
Amortization of debt issuance costs 110 106
Stock-based compensation expense 774 724
Provision for deferred income tax expense (benefit) (20) 262
Gain on sale of property, plant and equipment (238) (239)
Changes in operating assets and liabilities, net of amounts acquired:    
Accounts receivable (23,519) (20,149)
Inventories (4,436) (9,519)
Rental equipment (3,275) 153
Prepaid expenses and other assets 1,012 (1,895)
Trade accounts payable and accrued liabilities 11,621 5,736
Income taxes payable (4,226) (193)
Other long-term liabilities 305 (83)
Net cash provided by operating activities 12,422 5,000
Investing Activities    
Acquisitions, net of cash acquired (26,440) (188)
Purchase of property, plant and equipment (6,268) (6,191)
Proceeds from sale of property, plant and equipment 417 500
Net cash used in investing activities (32,291) (5,879)
Financing Activities    
Borrowings on bank revolving credit facility 109,000 49,000
Repayments on bank revolving credit facility (33,000) (29,000)
Principal payments on long-term debt and capital leases 0 (10)
Proceeds from issuance of debt 0 918
Dividends paid (2,297) (2,051)
Proceeds from sale of common stock 1,981 998
Redemptions of common stock to satisfy withholding taxes related to stock-based compensation (166) (19)
Net cash provided by financing activities 75,518 19,836
Effect of exchange rate changes on cash and cash equivalents 2,195 (907)
Net change in cash and cash equivalents 57,844 18,050
Cash and cash equivalents at beginning of the period 16,793 26,922
Cash and cash equivalents at end of the period 74,637 44,972
Cash paid during the period for:    
Interest 3,131 2,918
Income taxes $ 16,444 $ 11,725