Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net earnings	$ 39,025	$ 32,053
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	22,426	22,083
Stock compensation expense	3,459	2,885
Deferred income taxes	(179)	(11)
Provision for doubtful accounts	(50)	170
Foreign currency transaction (gain)/loss	(137)	218
Asset impairment charge	979	0
(Gain)/loss on disposal of assets	(551)	188
Changes in assets and liabilities
Accounts receivable	(7,560)	1,917
Inventories	(9,565)	(1,990)
Prepaid expenses and other current assets	(724)	(1,732)
Accounts payable and accrued expenses	754	(7,575)
Income taxes	(1,958)	(2,628)
Other	777	114
Net cash provided by operating activities	46,696	45,692
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	0	(16,759)
Capital expenditures	(7,700)	(10,819)
Proceeds from insurance	1,590	2,000
Proceeds from sale of assets	576	0
Intangible assets acquired	(296)	(330)
Net cash used in investing activities	(5,830)	(25,908)
Cash flows from financing activities:
Proceeds from revolving loan	210,750	22,000
Principal payments on revolving loan	0	(9,500)
Principal payments on long-term debt	(219,500)	(17,500)
Principal payment on acquired debt	0	(2,384)
Cash paid for financing costs	(1,123)	0
Proceeds from stock options exercised	6,578	4,893
Dividends paid	(13,428)	(12,069)
Purchase of treasury stock	(1,223)	(1,741)
Net cash used in financing activities	(17,946)	(16,301)
Effect of exchange rate changes on cash	(860)	1,473
Increase in cash and cash equivalents	22,060	4,956
Cash and cash equivalents beginning of period	40,416	38,643
Cash and cash equivalents end of period	$ 62,476	$ 43,599