CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 27, 2021	Mar. 28, 2020
Cash flows from operating activities:
Net income (loss)	$ 24,113	$ (4,404)
Adjustments to reconcile net income to net cash and cash equivalents provided by operating activities:
Amortization of intangibles	12,357	13,732
Depreciation	3,618	3,103
Share-based compensation	4,890	3,955
Acquired inventory step-up amortization	252	9,898
Provision for inventory valuation	2,267	928
Other, net	2,173	(144)
Changes in operating assets and liabilities, net of effects of business acquired	1,329	(18,170)
Net cash and cash equivalents provided by operating activities	50,999	8,898
Cash flows from investing activities:
Purchases of marketable securities	(83,652)	(76,460)
Proceeds from sales of marketable securities	53,973	74,857
Purchase of business, net of cash acquired	(26,795)
Purchases of property, plant and equipment	(3,875)	(997)
Net cash and cash equivalents used in investing activities	(60,349)	(2,600)
Cash flows from financing activities:
Purchase of common stock		(33,614)
Tax payments related to shares withheld for share-based compensation plans	(2,492)	(1,565)
Issuance of shares through share-based compensation plans	3,085	164
Net cash and cash equivalents provided by (used in) financing activities	593	(35,015)
Effect of exchange rate changes on cash and cash equivalents	(1,513)	(636)
Net decrease in cash and cash equivalents	(10,270)	(29,353)
Cash and cash equivalents at beginning of period	136,720	130,673
Cash and cash equivalents at end of period	126,450	101,320
Supplemental disclosure of cash flow information:
Income taxes paid	$ 1,799	$ 588