Fair Value Measurements (Tables)

9 Months Ended

Sep. 29, 2012

Assets and Liabilities that are Measured at Fair Value on a Recurring Basis

The following tables set forth by level within the fair value hierarchy, our financial assets that were accounted for at fair value on a recurring basis at September 29, 2012, and December 31, 2011, according to the valuation techniques we used to determine their fair value (in thousands):



	September 29, 2012
	Level 1		Level 2		Level 3		Total
Marketable debt securities – current
U.S. Treasury securities	$	20,023	$	—	$	—	$	20,023
Corporate bonds	—		16,518		—		16,518
U.S. Agency bonds	—		7,619		—		7,619
Municipal bonds	—		3,072		—		3,072
	20,023		27,209		—		47,232
Marketable debt securities – non-current
U.S. Treasury securities	15,027		—		—		15,027
Corporate bonds	—		10,360		—		10,360
U.S. Agency bonds	—		7,512		—		7,512
Municipal bonds	—		2,619		—		2,619
	15,027		20,491		—		35,518
	$	35,050	$	47,700	$	—	$	82,750



	December 31, 2011
	Level 1		Level 2		Level 3		Total
Marketable debt securities – current
U.S. Treasury securities	$	20,020	$	—	$	—	$	20,020

Marketable debt securities – non-current
U.S. Treasury securities	10,042		—		—		10,042
	$	30,062	$	—	$	—	$	30,062