CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 01, 2016	Apr. 03, 2015
Condensed Consolidated Statements Of Operations [Abstract]
Revenue	$ 129,279	$ 134,153
Cost of revenue	53,319	53,827
Gross profit	75,960	80,326
Operating costs and expenses:
Research and development	33,678	32,017
Selling, general and administrative	23,549	25,453
Amortization of purchased intangibles	3,528	5,561
Provision for TAOS litigation		81,100
Operating income (loss)	15,205	(63,805)
Interest expense and other	(482)	(257)
Gain on investments, net	1	773
Income (loss) before taxes	14,724	(63,289)
Income tax expense	2,973	5,535
Net income (loss)	$ 11,751	$ (68,824)
Earnings (loss) per share
Basic	$ 0.09	$ (0.53)
Diluted	0.09	(0.53)
Cash dividends declared per common share	$ 0.12	$ 0.12
Weighted average common shares outstanding:
Basic	132,857	130,513
Diluted	135,267	130,513