CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jul. 02, 2011	Jul. 03, 2010	Jul. 02, 2011	Jul. 03, 2010
Revenues	$ 228,785	$ 207,478	$ 453,108	$ 388,316
Cost of goods sold	136,643	121,995	273,572	234,334
Gross profit	92,142	85,483	179,536	153,982
Operating expenses:
Research, development and engineering	37,955	32,640	74,431	63,419
Selling, general and administrative	25,386	24,791	50,615	48,285
Litigation expense	7,512	1,340	12,911	2,326
Total operating expenses	70,853	58,771	137,957	114,030
Income from operations	21,289	26,712	41,579	39,952
Other income (expense), net:
Interest income	106	112	210	223
Interest expense	(354)	(167)	(741)	(371)
Foreign currency gain (loss)	87	7	31	(209)
Recovery of investment	356	0	507	0
Other, net	71	63	94	68
Total other income (expense), net	266	15	101	(289)
Income before income tax	21,555	26,727	41,680	39,663
Income tax expense	4,990	4,268	12,676	3,495
Net income	$ 16,565	$ 22,459	$ 29,004	$ 36,168
Net income per common share:
Basic	$ 0.1	$ 0.14	$ 0.18	$ 0.23
Diluted	$ 0.1	$ 0.14	$ 0.17	$ 0.23
Common equivalent shares:
Basic	164,110	154,938	163,257	154,244
Diluted	173,518	161,562	173,222	160,507