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 income	$ 65,091	$ 63,809	$ 62,560
Loss from discontinued operations	0	0	(405)
Income from continuing operations	65,091	63,809	62,965
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	19,949	20,374	21,690
Intangible asset impairment	0	1,552	247
Stock compensation expense	12,570	9,189	7,122
Exit activity costs (recoveries), non-cash	408	1,344	(1,877)
Provision for (benefit of) deferred income taxes	3,303	4,781	(7,105)
Other, net	5,296	1,243	1,995
Changes in operating assets and liabilities (excluding the effects of acquisitions):
Accounts receivable	(9,418)	9,737	(21,806)
Inventories	23,105	(16,951)	870
Other current assets and other assets	(9,118)	(22)	(2,629)
Accounts payable	2,571	(4,828)	11,332
Accrued expenses and other non-current liabilities	16,178	7,317	(2,734)
Net cash provided by operating activities	129,935	97,545	70,070
Cash Flows from Investing Activities
Purchases of property, plant, and equipment	(11,184)	(12,457)	(11,399)
Acquisitions, net of cash acquired	(8,595)	(5,241)	(18,494)
Net proceeds from sale of property and equipment	106	3,149	13,096
Net cash used in investing activities	(19,673)	(14,549)	(16,797)
Cash Flows from Financing Activities
Long-term debt payments	(212,000)	(400)	(400)
Payment of debt issuance costs	(1,235)	0	0
Purchase of treasury stock at market prices	(4,305)	(7,165)	(2,872)
Net proceeds from issuance of common stock	490	1,385	674
Net cash used in financing activities	(217,050)	(6,180)	(2,598)
Effect of exchange rate changes on cash	1,145	(2,090)	1,428
Net (decrease) increase in cash and cash equivalents	(105,643)	74,726	52,103
Cash and cash equivalents at beginning of year	297,006	222,280	170,177
Cash and cash equivalents at end of year	$ 191,363	$ 297,006	$ 222,280