Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 27, 2021	Mar. 28, 2020
Net sales		$ 225,488	$ 138,921
Cost and expenses:
Cost of sales (1)	[1]	123,283	82,837
Research and development		23,152	22,468
Selling, general and administrative		32,739	33,352
Amortization of purchased intangible assets		9,244	9,538
Restructuring charges		1,340	403
Impairment charges		0	3,949
Costs and Expenses, Total		189,758	152,547
Income (loss) from operations		35,730	(13,626)
Other (expense) income:
Interest expense		(2,575)	(4,427)
Interest income		50	147
Foreign transaction loss		(262)	(404)
Loss on extinguishment of debt		(1,761)	0
Income (loss) from continuing operations before taxes		31,182	(18,310)
Income tax provision (benefit)		3,575	(992)
Income (loss) from continuing operations		27,607	(17,318)
Income from discontinued operations		0	42
Net income (loss)		$ 27,607	$ (17,276)
Basic:
Income (loss) from continuing operations (in dollars per share)		$ 0.63	$ (0.42)
Income from discontinued operations (in dollars per share)		0	0.00
Net income (loss) (in dollars per share)		0.63	(0.42)
Diluted:
Income (loss) from continuing operations (in dollars per share)		0.61	(0.42)
Income from discontinued operations (in dollars per share)		0	0.00
Net income (loss) (in dollars per share)		$ 0.61	$ (0.42)
Weighted average shares used in computing income (loss) per share:
Basic (in shares)		43,756	41,502
Diluted (in shares)		45,482	41,502
Cash dividend, per share (in dollars per share)		$ 0	$ 0.06

[1] Excludes amortization of $7,101 and $7,266 for the three months ended March 27, 2021 and March 28, 2020, respectively.