Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net earnings	$ 78,573	$ 90,071	$ 55,972
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	44,666	44,379	46,202
Stock compensation expense	6,413	6,264	7,024
Deferred income taxes	(5,403)	(28,777)	(6,881)
Provision for doubtful accounts	43	69	258
Foreign currency transaction (gain)/loss	(141)	340	(16)
Asset impairment charge	1,801	0	0
(Gain)/Loss on disposal of assets	(3,244)	254	320
Changes in assets and liabilities, net of acquired balances
Accounts receivable	(7,773)	(3,906)	(15,659)
Inventories	(6,016)	(319)	4,745
Prepaid expenses and other current assets	1,517	(439)	240
Accounts payable and accrued expenses	5,988	1,511	17,841
Income taxes	1,121	449	(2,765)
Other	1,152	722	331
Net cash provided by operating activities	118,697	110,618	107,612
Cash flows from investing activities:
Capital expenditures	(19,170)	(27,526)	(23,034)
Cash paid for acquisitions, net of cash acquired	(17,399)	(17,393)	(110,601)
Proceeds from sale of property, plant and equipment	966	22	4
Proceeds from insurance	4,165	2,792	1,000
Intangible assets acquired	(553)	(591)	(963)
Net cash used in investing activities	(31,991)	(42,696)	(133,594)
Cash flows from financing activities:
Proceeds from revolving loan	210,750	25,000	72,500
Principal payments on revolving loan	(54,750)	(44,000)	(53,500)
Principal payments on long-term debt	(219,500)	(43,000)	(35,000)
Principal payment on acquired debt	(19)	(2,384)	(884)
Cash paid for financing costs	(1,374)	0	0
Proceeds from stock options exercised	8,272	9,732	7,192
Excess tax benefits from stock compensation	0	0	2,546
Dividends paid	(13,432)	(12,069)	(10,720)
Purchase of treasury stock	(1,394)	(1,905)	(1,588)
Net cash used in by financing activities	(71,447)	(68,626)	(19,454)
Effect of exchange rate changes on cash	(1,407)	2,477	(716)
Increase/(Decrease) in cash and cash equivalents	13,852	1,773	(46,152)
Cash and cash equivalents beginning of period	40,416	38,643	84,795
Cash and cash equivalents end of period	$ 54,268	$ 40,416	$ 38,643