CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019
OPERATING ACTIVITIES
Net (loss) income	$ 15,653	$ 80,781
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	27,728	25,727
Amortization of intangibles	19,808	20,241
Deferred revenue	(289)	0
Impairment charges	36,078	0
Stock-based compensation	10,852	12,250
Loss on investments and other assets	542	2,458
Deferred income taxes	2,512	(632)
Other	(1,222)	2,009
Changes in operating assets and liabilities:
Trade receivables	13,914	(13,242)
Inventories	(10,761)	6,230
Accounts payable	3,439	(17,927)
Accrued liabilities and income taxes	(19,144)	(36,713)
Prepaid expenses and other assets	2,176	(1,090)
Net cash provided by operating activities	101,286	80,092
INVESTING ACTIVITIES
Acquisitions of businesses, net of cash acquired	0	(775)
Purchases of property, plant, and equipment	(29,479)	(25,249)
Net proceeds from sale of property, plant and equipment	89	6,212
Net cash used in investing activities	(29,390)	(19,812)
FINANCING ACTIVITIES
Proceeds of revolving credit facility	240,000	0
Payments of term loan	(145,000)	(7,500)
Net proceeds related to stock-based award activities	3,642	3,011
Purchases of common stock	(22,927)	(49,861)
Debt issuance costs	(1,786)	0
Cash dividends paid	(23,403)	(21,274)
Net cash provided by (used in) financing activities	50,526	(75,624)
Effect of exchange rate changes on cash and cash equivalents	(1,694)	392
Increase (decrease) in cash and cash equivalents	120,728	(14,952)
Cash and cash equivalents at beginning of period	531,139	489,733
Cash and cash equivalents at end of period	651,867	474,781
Supplementary Cash Flow Information
Cash paid during the period for interest	10,799	11,478
Capital expenditures, not yet paid	$ 4,665	$ 0