CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 27, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net income	$ 3,020	$ 13,102
Adjustments to reconcile net income to net cash and cash equivalents provided by operating activities:
Amortization of intangibles	27,435	774
Depreciation	6,240	2,363
Share-based compensation	8,730	3,836
Acquired inventory step-up amortization	10,173
Provision for doubtful accounts and inventory valuation	3,108	1,003
Other, net	1,102	(222)
Changes in operating assets and liabilities	(12,937)	(11,066)
Net cash and cash equivalents provided by operating activities	46,871	9,790
Cash flows from investing activities:
Purchases of marketable securities	(140,364)	(38,227)
Proceeds from sales of marketable securities	147,473	33,186
Cash received from convertible note receivable	2,848
Purchases of property, plant and equipment	(2,609)	(2,654)
Net cash and cash equivalents provided by (used in) investing activities	7,348	(7,695)
Cash flows from financing activities:
Purchase of common stock	(52,000)	(744)
Tax payments related to shares withheld for share-based compensation plans	(3,279)	(749)
Payment of contingent consideration for acquired business	(435)	(1,121)
Issuance of shares through share-based compensation plans	179	160
Net cash and cash equivalents used in financing activities	(55,535)	(2,454)
Effect of exchange rate changes on cash and cash equivalents	31	(71)
Net decrease in cash and cash equivalents	(1,285)	(430)
Cash and cash equivalents at beginning of period	130,673	112,388
Cash and cash equivalents at end of period	129,388	111,958
Supplemental disclosure of cash flow information:
Income taxes paid	$ 3,463	$ 209