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Interim Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Operating Activities    
Net income $ 12,167 $ 8,659
Adjustment to reconcile net income to net cash used in operating activities:    
Provision for doubtful accounts (7) 69
Depreciation 4,184 4,579
Amortization of intangibles 777 772
Amortization of debt issuance costs 55 53
Stock-based compensation expense 328 285
Provision for deferred income tax expense (benefit) (41) 292
Gain on sale of property, plant and equipment (67) (165)
Changes in operating assets and liabilities, net of amounts acquired:    
Accounts receivable (25,048) (16,383)
Inventories (4,696) (4,337)
Rental equipment 1,516 1,916
Prepaid expenses and other assets 358 (1,241)
Trade accounts payable and accrued liabilities 4,776 655
Income taxes payable 4,323 (47)
Other long-term liabilities (68) (154)
Net cash used in operating activities (1,443) (5,047)
Investing Activities    
Acquisitions, net of cash acquired 0 (188)
Purchase of property, plant and equipment (2,257) (1,761)
Proceeds from sale of property, plant and equipment 74 354
Net cash used in investing activities (2,183) (1,595)
Financing Activities    
Borrowings on bank revolving credit facility 66,000 44,000
Repayments on bank revolving credit facility (9,000) (15,000)
Principal payments on long-term debt and capital leases 0 (6)
Proceeds from issuance of debt 460 0
Dividends paid (1,146) (1,025)
Proceeds from sale of common stock 606 317
Net cash provided by financing activities 56,920 28,286
Effect of exchange rate changes on cash and cash equivalents 575 1,088
Net change in cash and cash equivalents 53,869 22,732
Cash and cash equivalents at beginning of the period 16,793 26,922
Cash and cash equivalents at end of the period 70,662 49,654
Cash paid during the period for:    
Interest 1,485 1,419
Income taxes $ 2,366 $ 5,735