Other Income, Net (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Other Income, Net
Interest income	$ 425	$ 337
Gains (losses) on sale of marketable debt and equity securities, net	(25)	117
Gains on sale of non-marketable equity investments	1,190	0
Gains on securities in Cadence’s NQDC	152	1,798
Gains on foreign exchange	764	100
Other income (expense), net	(331)	82
Total other income, net	$ 2,175	$ 2,434