Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2012	Jul. 01, 2011	Jun. 29, 2012	Jul. 01, 2011
Accumulated other comprehensive income [Line Items]
Accumulated unrealized (losses) gains on available-for-sale securities, net of tax			$ (133)
Accumulated unrealized (losses) gains on available-for-sale securities, net of tax, Other comprehensive income	2,796	0	3,080	0
Accumulated unrealized (losses) gains on available-for-sale securities, net of tax	2,947		2,947
Accumulated unrealized losses on hedging transactions, net of tax			0
Accumulated unrealized losses on hedging transactions, net of tax, Other Comprehensive Income	21	0	(15)	0
Accumulated unrealized losses on hedging transactions, net of tax	(15)		(15)
Accumulated other comprehensive income (loss)			(133)
Accumulated other comprehensive income (loss), Other comprehensive income	2,817	0	3,065	0
Accumulated other comprehensive income (loss)	$ 2,932		$ 2,932