Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Revenues	$ 206,709	$ 217,106	$ 394,822	$ 422,490
Costs of revenues	79,660	85,814	151,899	166,961
Gross profit	127,049	131,292	242,923	255,529
Operating expenses:
Research and development	63,856	59,495	125,422	114,323
Selling, general and administrative	48,637	53,796	97,853	99,490
Operating expenses	112,493	113,291	223,275	213,813
Operating income	14,556	18,001	19,648	41,716
Other income (expense):
Interest income and other, net	3,696	1,609	6,519	4,811
Interest expense	(5,005)	(4,888)	(10,002)	(9,771)
Income before income taxes	13,247	14,722	16,165	36,756
Provision (benefit) for income taxes	29,276	442	26,796	(3,929)
Net income (loss)	$ (16,029)	$ 14,280	$ (10,631)	$ 40,685
Earnings (loss) per share:
Basic (in dollars per share)	$ (0.37)	$ 0.33	$ (0.25)	$ 0.94
Diluted (in dollars per share)	$ (0.37)	$ 0.32	$ (0.25)	$ 0.92
Weighted-average common shares outstanding:
Basic (in shares)	43,386	43,312	43,287	43,138
Diluted (in shares)	43,386	44,294	43,287	44,106