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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 01, 2012 BusinessSegment	Jul. 03, 2011	Jul. 01, 2012	Jul. 03, 2011
Information about the Company's segments
Product revenue	$ 78,449	$ 77,566	$ 149,856	$ 146,443
Service revenue	5,877	5,827	12,179	11,344
Operating income	23,350	24,042	41,091	41,410
Segment Information (Textual) [Abstract]
Number of reportable segments	2
MVSD [Member]
Information about the Company's segments
Product revenue	69,743	70,942	133,964	133,759
Service revenue	1,778	1,834	3,698	3,803
Operating income	25,035	26,587	46,179	48,614
SISD [Member]
Information about the Company's segments
Product revenue	8,706	6,624	15,892	12,684
Service revenue	4,099	3,993	8,481	7,541
Operating income	2,848	2,022	5,240	3,019
Reconciling Items [Member]
Information about the Company's segments
Operating income	$ (4,533)	$ (4,567)	$ (10,328)	$ (10,223)

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