Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net earnings	$ 79,671	$ 78,573	$ 90,071
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	45,862	44,666	44,379
Stock compensation expense	7,596	6,413	6,264
Deferred income taxes	(3,563)	(5,403)	(28,777)
Provision for doubtful accounts	1,776	43	69
Foreign currency transaction (gain)/loss	72	(141)	340
Asset impairment charge	1,140	1,801	0
(Gain)/Loss on disposal of assets	(3,134)	(3,244)	254
Changes in assets and liabilities, net of acquired balances
Accounts receivable	11,623	(7,773)	(3,906)
Inventories	(11,401)	(6,016)	(319)
Prepaid expenses and other current assets	477	1,517	(439)
Accounts payable and accrued expenses	1,134	5,988	1,511
Income taxes	(5,664)	1,121	449
Other	(1,128)	1,152	722
Net cash provided by operating activities	124,461	118,697	110,618
Cash flows from investing activities:
Capital expenditures and intangible assets acquired	(28,413)	(19,723)	(28,117)
Cash paid for acquisitions, net of cash acquired	(141,062)	(17,399)	(17,393)
Proceeds from sale of business and assets	11,523	966	22
Proceeds from insurance	2,727	4,165	2,792
Purchase of convertible note	(1,000)	0	0
Net cash used in investing activities	(156,225)	(31,991)	(42,696)
Cash flows from financing activities:
Proceeds from revolving loan	168,569	210,750	25,000
Principal payments on revolving loan	(76,000)	(54,750)	(44,000)
Principal payments on long-term debt	0	(219,500)	(43,000)
Principal payment on acquired debt	(17,567)	(19)	(2,384)
Cash paid for financing costs	0	(1,374)	0
Proceeds from stock options exercised	4,839	8,272	9,732
Dividends paid	(15,135)	(13,432)	(12,069)
Purchase of treasury stock	(21,321)	(1,394)	(1,905)
Net cash used in by financing activities	43,385	(71,447)	(68,626)
Effect of exchange rate changes on cash	(217)	(1,407)	2,477
Increase/(Decrease) in cash and cash equivalents	11,404	13,852	1,773
Cash and cash equivalents beginning of period	54,268	40,416	38,643
Cash and cash equivalents end of period	$ 65,672	$ 54,268	$ 40,416