Condensed Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2012	Sep. 30, 2011	Sep. 28, 2012	Sep. 30, 2011
Condensed Consolidated Statements Of Operations [Abstract]
Revenue	$ 151,406	$ 186,788	$ 470,410	$ 594,724
Cost of revenue	69,502	80,240	214,513	251,366
Gross profit	81,904	106,548	255,897	343,358
Operating costs and expenses:
Research and development	38,733	45,651	129,329	143,139
Selling, general and administrative	30,191	34,225	100,805	105,747
Amortization of purchased intangibles	7,105	6,528	21,539	20,136
Income from intellectual property agreement	(13,412)		(13,412)
Restructuring and related costs	44	13	9,838	2,413
Operating (loss) income	19,243	20,131	7,798	71,923
Interest income	116	681	428	2,160
Interest expense and fees	(2,016)	(3,789)	(5,852)	(12,504)
Loss on extinguishment of debt		(8,399)		(8,399)
Gain (loss) on deferred compensation investments, net	654	(1,107)	881	(937)
Income before income taxes	17,997	7,517	3,255	52,243
Income tax expense	16,014	305	19,084	9,138
Net income (loss)	$ 1,983	$ 7,212	$ (15,829)	$ 43,105
(Loss) income per share:
Basic	$ 0.02	$ 0.06	$ (0.12)	$ 0.34
Diluted	$ 0.02	$ 0.06	$ (0.12)	$ 0.34
Cash dividends declared per common share	$ 0.12	$ 0.12	$ 0.36	$ 0.36
Weighted average common shares outstanding
Basic	127,540	125,916	127,221	125,695
Diluted	127,561	126,044	127,221	126,049