Interim Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Operating Activities
Net income	$ 32,457	$ 31,825
Adjustment to reconcile net income to net cash provided by operating activities:
Provision for doubtful accounts	124	628
Depreciation	13,451	14,196
Amortization of intangibles	2,328	2,339
Amortization of debt issuance costs	159	159
Stock-based compensation expense	1,075	762
Excess tax benefits from stock-based payment arrangements	(212)	(80)
Provision for deferred income tax expense (benefit)	5,111	8
Gain on sale of property, plant and equipment	(367)	(113)
Changes in operating assets and liabilities, net of amounts acquired:
Accounts receivable	2,552	(5,721)
Inventories	(4,265)	(12,935)
Rental equipment	199	(14,427)
Prepaid expenses and other assets	(2,216)	(2,257)
Trade accounts payable and accrued liabilities	(1,895)	12,318
Income taxes payable	(524)	4,989
Other long-term liabilities	59	(473)
Net cash provided by operating activities	48,036	31,218
Investing Activities
Acquisitions, net of cash acquired	(188)	(3,465)
Purchase of property, plant and equipment	(7,201)	(7,030)
Proceeds from sale of property, plant and equipment	899	197
Purchase of patents	(50)	0
Net cash used in investing activities	(6,540)	(10,298)
Financing Activities
Borrowings on bank revolving credit facility	71,000	62,000
Repayments on bank revolving credit facility	(81,000)	(77,000)
Principal payments on long-term debt and capital leases	(37)	(28)
Proceeds from issuance of debt	1,149	0
Dividends paid	(3,082)	(2,719)
Proceeds from sale of common stock	1,254	2,008
Excess tax benefits from stock-based payment arrangements	212	80
Stock repurchased	(19)	0
Net cash used in financing activities	(10,523)	(15,659)
Effect of exchange rate changes on cash and cash equivalents	(1,410)	(2,137)
Net change in cash and cash equivalents	29,563	3,124
Cash and cash equivalents at beginning of the period	26,922	39,533
Cash and cash equivalents at end of the period	56,485	42,657
Cash paid during the period for:
Interest	4,433	5,075
Income taxes	$ 14,178	$ 14,691