Fair Value Measurements (Tables)

9 Months Ended

Sep. 27, 2014

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 according to the valuation techniques we used to determine their fair value (in thousands):



	September 27, 2014
	Level 1		Level 2		Level 3		Total
Marketable debt securities – current
U.S. Treasury securities	$	17,516	$	—	$	—	$	17,516
Corporate bonds	—		17,736		—		17,736
U.S. Agency bonds	—		9,544		—		9,544
Municipal bonds	—		5,526		—		5,526
Commercial paper	—		4,995		—		4,995
	17,516		37,801		—		55,317
Marketable debt securities – non-current
U.S. Treasury securities	14,996		—		—		14,996
Corporate bonds	—		15,242		—		15,242
U.S. Agency bonds	—		10,019		—		10,019
Municipal bonds	—		3,119		—		3,119
	14,996		28,380		—		43,376
	$	32,512	$	66,181	$	—	$	98,693



	December 28, 2013
	Level 1		Level 2		Level 3		Total
Marketable debt securities – current
U.S. Treasury securities	$	15,011	$	—	$	—	$	15,011
Corporate bonds	—		20,300		—		20,300
U.S. Agency bonds	—		12,025		—		12,025
Municipal bonds	—		4,823		—		4,823
	15,011		37,148		—		52,159
Marketable debt securities – non-current
U.S. Treasury securities	8,978		—		—		8,978
Corporate bonds	—		15,484		—		15,484
U.S. Agency bonds	—		7,498		—		7,498
Municipal bonds	—		2,672		—		2,672
	8,978		25,654		—		34,632
	$	23,989	$	62,802	$	—	$	86,791