Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 25, 2021	Dec. 26, 2020
Net sales		$ 812,775	$ 887,214	$ 636,007
Cost and expenses:
Cost of sales (1)	[1]	429,449	500,253	364,225
Research and development		92,589	91,963	86,151
Selling, general and administrative		131,390	126,958	129,248
Amortization of cost		33,185	35,414	38,746
Gain on sale of PCB Test business (2)	[2]	0	(70,815)	0
Restructuring charges (Note 4)		605	1,823	7,623
Impairment charges		0	100	11,249
Gain on sale of facilities		0	0	(4,495)
Costs and Expenses, Total		687,218	685,696	632,747
Income from operations		125,557	201,518	3,260
Other (expense) income:
Interest expense		(4,177)	(6,413)	(13,759)
Interest income		4,012	239	224
Foreign transaction gain (loss)		1,635	411	(3,170)
Gain (loss) on extinguishment of debt		(312)	(3,411)	268
Total		126,715	192,344	(13,177)
Income tax provision		29,868	25,019	666
Income (loss) from continuing operations		96,847	167,325	(13,843)
Income from discontinued operations, net of tax		0	0	42
Net income (loss)		$ 96,847	$ 167,325	$ (13,801)
Basic:
Income (loss) from continuing operations (in dollars per share)		$ 2.01	$ 3.53	$ (0.33)
Income from discontinued operations (in dollars per share)		0	0	0.00
Net income (loss) (in dollars per share)		2.01	3.53	(0.33)
Diluted:
Income (loss) from continuing operations (in dollars per share)		1.98	3.45	(0.33)
Income from discontinued operations (in dollars per share)		0	0	0.00
Net income (loss) (in dollars per share)		$ 1.98	$ 3.45	$ (0.33)
Weighted average shares used in computing income (loss) per share:
Basic (in shares)		48,178	47,409	41,854
Diluted (in shares)		48,799	48,460	41,854

[1] Excludes amortization of $26,023, $27,508, and $29,510 for the years ended December 31, 2022, December 25, 2021, and December 26, 2020, respectively.

[2] On June 24, 2021 we completed the divestment of our PCB Test business. The divestment of this business did not qualify for presentation as discontinued operations and the results of the PCB Test business are included in continuing operations for all periods presented. See Note 14, “Business Divestitures and Discontinued Operations” for additional information on this transaction and financial statement presentation.