Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
OPERATING ACTIVITIES
Net income	$ 24,644	$ 36,989
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	13,821	13,088
Amortization of intangibles	9,981	10,191
Deferred revenue	(145)	0
Impairment charges	2,237
Stock-based compensation	2,965	3,966
Loss on investments and other assets	2,604	2,810
Deferred income taxes	616	(72)
Other	3,547	5,393
Changes in operating assets and liabilities:
Trade receivables	(9,457)	(5,800)
Inventories	6,667	(3,250)
Accounts payable	(3,964)	(8,499)
Accrued liabilities and income taxes	(7,012)	(27,170)
Prepaid expenses and other assets	(1,225)	3,273
Net cash provided by operating activities	45,279	30,919
INVESTING ACTIVITIES
Acquisitions of businesses, net of cash acquired	0	(775)
Purchases of property, plant, and equipment	(16,586)	(14,076)
Net proceeds from sale of property, plant and equipment	50	607
Net cash used in investing activities	(16,536)	(14,244)
FINANCING ACTIVITIES
Proceeds of revolving credit facility	100,000	0
Payments of term loan	(2,500)	(5,000)
Net proceeds related to stock-based award activities	2,956	2,198
Purchases of common stock	(22,927)	(17,906)
Cash dividends paid	(11,725)	(10,625)
Net cash provided by (used in) financing activities	65,804	(31,333)
Effect of exchange rate changes on cash and cash equivalents	(5,111)	1,539
Increase (decrease) in cash and cash equivalents	89,436	(13,119)
Cash and cash equivalents at beginning of period	531,139	489,733
Cash and cash equivalents at end of period	620,575	476,614
Supplementary Cash Flow Information
Cash paid during the period for interest	7,354	8,011
Capital expenditures, not yet paid	$ 5,832	$ 0