Financial Instruments Measured at Fair Value (Tables)

9 Months Ended

Sep. 28, 2013

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Short-Term Investments by Security Type

Investments that we have classified as short-term, by security type, are as follows (in thousands):

	September 28, 2013
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Municipal securities	$	1,200	$	—	$	—	$	1,200
Government-sponsored enterprise securities		5,405		4		—		5,409
	$	6,605	$	4	$	—	$	6,609

	December 29, 2012
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Municipal securities	$	1,470	$	—	$	—	$	1,470
Government-sponsored enterprise securities		5,937		14		—		5,951
	$	7,407	$	14	$	—	$	7,421

Effective Maturities of Short-Term Investments

Effective maturities of short-term investments at September 28, 2013 and December 29, 2012, were as follows (in thousands):

	September 28, 2013				December 29, 2012
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due in one year or less	$	6,605	$	6,609	$	7,407	$	7,421

Assets Measured at Fair Value on Recurring Basis

The following table summarizes, by major security type, our assets that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy (in thousands):

	Fair value measurements at September 28, 2013 using:
	Level 1		Level 2		Level 3		Total estimated fair value
Cash	$	44,167	$	—	$	—	$	44,167
Municipal securities		—		1,200		—		1,200
Government-sponsored enterprise securities		—		5,409		—		5,409
Money market funds		—		2,081		—		2,081
	$	44,167	$	8,690	$	—	$	52,857

	Fair value measurements at December 29, 2012 using:
	Level 1		Level 2		Level 3		Total estimated fair value
Cash	$	101,054	$	—	$	—	$	101,054
Municipal securities		—		1,470		—		1,470
Government-sponsored enterprise securities		—		5,951		—		5,951
Money market funds		—		1,754		—		1,754
	$	101,054	$	9,175	$	—	$	110,229