CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020
Cash flows from operating activities:
Net income	$ 59,164	$ 3,020
Adjustments to reconcile net income to net cash and cash equivalents provided by operating activities:
Amortization of intangibles	24,681	27,435
Depreciation	7,484	6,240
Share-based compensation	10,997	8,730
Acquired inventory step-up amortization	252	10,173
Provision for inventory valuation	3,706	3,108
Other, net	1,892	1,102
Changes in operating assets and liabilities, net of effects of business acquired	(31,748)	(12,937)
Net cash and cash equivalents provided by operating activities	76,428	46,871
Cash flows from investing activities:
Purchases of marketable securities	(142,072)	(140,364)
Proceeds from sales of marketable securities	102,027	147,473
Cash received from convertible note receivable		2,848
Purchase of business, net of cash acquired	(26,795)
Purchases of property, plant and equipment	(9,558)	(2,609)
Net cash and cash equivalents (used in) provided by investing activities	(76,398)	7,348
Cash flows from financing activities:
Purchase of common stock		(52,000)
Tax payments related to shares withheld for share-based compensation plans	(6,499)	(3,279)
Payment of contingent consideration for acquired business		(435)
Issuance of shares through share-based compensation plans	3,215	179
Net cash and cash equivalents used in financing activities	(3,284)	(55,535)
Effect of exchange rate changes on cash and cash equivalents	752	31
Net decrease in cash and cash equivalents	(2,502)	(1,285)
Cash and cash equivalents at beginning of period	136,720	130,673
Cash and cash equivalents at end of period	134,218	129,388
Supplemental disclosure of cash flow information:
Income taxes paid	$ 4,980	$ 3,463