Marketable Debt Securities (Tables)

9 Months Ended

Sep. 28, 2013

Investments [Abstract]

Investments of marketable debt securities

Investments in marketable debt securities were comprised of the following (in thousands):

	September 28, 2013
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value(1)
U.S. Treasury securities	$	23,998	$	24	$	—		$	24,022
Corporate bonds	33,100		5		(22		)	33,083
U.S. Agency bonds	17,528		12		(1		)	17,539
Municipal bonds	8,427		23		(4		)	8,446
	$	83,053	$	64	$	(27	)	$	83,090

	December 29, 2012
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value(1)
U.S. Treasury securities	$	32,518	$	24	$	—		$	32,542
Corporate bonds	31,929		2		(23		)	31,908
U.S. Agency bonds	17,632		11		(1		)	17,642
Municipal bonds	7,794		20		—			7,814
	$	89,873	$	57	$	(24	)	$	89,906

Maturities of marketable debt securities

Maturities of marketable debt securities were as follows (in thousands):

	September 28, 2013				December 29, 2012
	Amortized Cost		Fair Value(1)		Amortized Cost		Fair Value(1)
Marketable debt securities – current (due in less than one year)	$	57,371	$	57,407	$	51,238	$	51,264
Marketable debt securities – non-current (due in one to two years)	25,682		25,683		38,635		38,642
	$	83,053	$	83,090	$	89,873	$	89,906

⁽¹⁾ See Note 2 for discussion of fair value measurements.