Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows from Operating Activities
Net income	$ 64,566	$ 65,091	$ 63,809
(Loss) income from discontinued operations	(18,725)	5,163	9,697
Income from continuing operations	83,291	59,928	54,112
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	20,915	17,557	17,439
Intangible asset impairment	0	0	1,552
Gain on sale of business	(1,881)	0	0
Stock compensation expense	8,173	12,570	9,189
Exit activity costs, non-cash	493	408	1,344
Provision for deferred income taxes	3,786	4,120	4,725
Other, net	1,944	5,399	1,759
Changes in operating assets and liabilities (excluding the effects of acquisitions):
Accounts receivable	2,277	(11,256)	9,665
Inventories	(5,719)	14,272	(12,322)
Other current assets and other assets	5,467	(9,306)	38
Accounts payable	(1,160)	4,804	(5,491)
Accrued expenses and other non-current liabilities	(44,570)	14,040	2,351
Net cash provided by operating activities of continuing operations	73,016	112,536	84,361
Net cash provided by operating activities of discontinued operations	16,088	17,399	13,184
Net cash provided by operating activities	89,104	129,935	97,545
Cash Flows from Investing Activities
Purchases of property, plant, and equipment	(13,068)	(8,776)	(10,368)
Acquisitions, net of cash acquired	(313,686)	(8,595)	(5,241)
Net proceeds from sale of property and equipment	77	92	348
Net proceeds from sale of business	2,000	0	0
Net cash used in investing activities of continuing operations	(324,677)	(17,279)	(15,261)
Net cash (used in) provided by investing activities of discontinued operations	(2,033)	(2,394)	712
Net cash used in investing activities	(326,710)	(19,673)	(14,549)
Cash Flows from Financing Activities
Long-term debt payments	0	(212,000)	(400)
Proceeds from long-term debt	85,000	0	0
Payment of debt issuance costs	0	(1,235)	0
Purchase of treasury stock at market prices	(6,656)	(4,305)	(7,165)
Net proceeds from issuance of common stock	1,119	490	1,385
Net cash provided by (used in) financing activities	79,463	(217,050)	(6,180)
Effect of exchange rate changes on cash	(1,166)	1,145	(2,090)
Net (decrease) increase in cash and cash equivalents	(159,309)	(105,643)	74,726
Cash and cash equivalents at beginning of year	191,363	297,006	222,280
Cash and cash equivalents at end of year	$ 32,054	$ 191,363	$ 297,006