CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Mar. 28, 2020
Operating Activities
Net income	$ 38,192	$ 15,338
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	7,501	7,214
Stock-based compensation	3,381	1,354
(Gain) loss on sale of assets	(11)
Deferred income taxes	2,406	1,530
Changes in operating assets and liabilities:
Trade receivables	(15,289)	(3,196)
Inventories	323	10,012
Trade accounts payable and accrued expenses	(1,836)	(266)
Contract liability to customers	(84)	(1,060)
Employee compensation and benefits	(16,495)	127
Product liability	(108)	(58)
Prepaid expenses, other assets and other liabilities	530	(2,384)
Income taxes payable	9,260	2,460
Cash provided by operating activities	27,770	31,071
Investing Activities
Property, plant and equipment additions	(5,516)	(4,094)
Proceeds from sale of assets	11
Purchases of short-term investments	(146,992)	(89,535)
Proceeds from maturities of short-term investments	146,002	69,448
Cash used for investing activities	(6,495)	(24,181)
Financing Activities
Remittance of taxes withheld from employees related to share-based compensation	(4,801)	(1,297)
Dividends paid	(12,484)	(3,034)
Cash used for financing activities	(17,285)	(4,331)
Increase in cash and cash equivalents	3,990	2,559
Cash and cash equivalents at beginning of period	20,147	35,420
Cash and cash equivalents at end of period	$ 24,137	$ 37,979