Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net earnings	$ 19,346	$ 15,518
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	11,127	11,335
Stock compensation expense	1,793	1,840
Deferred income taxes	(38)	(4)
Provision for doubtful accounts	(69)	79
Foreign currency transaction loss	51	101
Asset impairment charge	71	0
Gain on disposal of assets	(1,093)	(75)
Changes in assets and liabilities
Accounts receivable	(4,340)	4,128
Inventories	(5,442)	(5,574)
Prepaid expenses and other current assets	345	(4)
Accounts payable and accrued expenses	(2,273)	(9,066)
Income taxes	5,633	5,248
Other	368	(724)
Net cash provided by operating activities	25,479	22,802
Cash flows from investing activities:
Cash paid for acquisition, net of cash acquired	0	(1,169)
Capital expenditures	(3,735)	(2,934)
Proceeds from insurance	1,590	0
Intangible assets acquired	(119)	(147)
Net cash used in investing activities	(2,264)	(4,250)
Cash flows from financing activities:
Proceeds from revolving loan	0	2,000
Principal payments on revolving loan	0	(5,000)
Principal payments on long-term debt	(8,750)	(8,750)
Principal payment on acquired debt	0	0
Proceeds from stock options exercised	1,261	3,969
Dividends paid	(13,421)	(12,069)
Purchase of treasury stock	(786)	(611)
Net cash used in financing activities	(21,696)	(20,461)
Effect of exchange rate changes on cash	744	263
Increase/(Decrease) in cash and cash equivalents	2,263	(1,646)
Cash and cash equivalents beginning of period	40,416	38,643
Cash and cash equivalents end of period	$ 42,679	$ 36,997