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Interim Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Operating Activities    
Net income $ 41,075 $ 32,457
Adjustment to reconcile net income to net cash provided by operating activities:    
Provision for doubtful accounts (2) 124
Depreciation - PP&E 8,631 8,500
Depreciation - Rental 4,253 4,951
Amortization of intangibles 2,445 2,328
Amortization of debt issuance costs 166 159
Stock-based compensation expense 1,254 1,075
Provision for deferred income tax expense (benefit) (74) 5,111
Gain on sale of property, plant and equipment (312) (367)
Changes in operating assets and liabilities, net of amounts acquired:    
Accounts receivable (20,330) 2,552
Inventories (4,075) (4,265)
Rental equipment (4,327) 199
Prepaid expenses and other assets 2,828 (2,216)
Trade accounts payable and accrued liabilities 10,811 (1,895)
Income taxes payable (665) (524)
Other long-term liabilities 204 59
Net cash provided by operating activities 41,882 48,248
Investing Activities    
Acquisitions, net of cash acquired (38,523) (188)
Purchase of property, plant and equipment (9,686) (7,201)
Proceeds from sale of property, plant and equipment 555 899
Purchase of patents 0 (50)
Net cash used in investing activities (47,654) (6,540)
Financing Activities    
Borrowings on bank revolving credit facility 126,000 71,000
Repayments on bank revolving credit facility (70,000) (81,000)
Principal payments on long-term debt and capital leases (17) (37)
Proceeds from issuance of debt 0 1,149
Dividends paid (3,455) (3,082)
Proceeds from sale of common stock 2,059 1,254
Redemptions of common stock to satisfy withholding taxes related to stock-based compensation (166) (19)
Net cash provided by (used in) financing activities 54,421 (10,735)
Effect of exchange rate changes on cash and cash equivalents 3,626 (1,410)
Net change in cash and cash equivalents 52,275 29,563
Cash and cash equivalents at beginning of the period 16,793 26,922
Cash and cash equivalents at end of the period 69,068 56,485
Cash paid during the period for:    
Interest 5,073 4,433
Income taxes $ 20,699 $ 14,178