Marketable Debt Securities (Tables)

6 Months Ended

Jun. 29, 2013

Investments [Abstract]

Investments of marketable debt securities

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

	June 29, 2013
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value(1)
U.S. Treasury securities	$	22,504	$	14	$	—		$	22,518
Corporate bonds	35,569		—		(57		)	35,512
U.S. Agency bonds	17,544		7		(6		)	17,545
Municipal bonds	6,713		1		—			6,714
	$	82,330	$	22	$	(63	)	$	82,289

	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):

	June 29, 2013				December 29, 2012
	Amortized Cost		Fair Value(1)		Amortized Cost		Fair Value(1)
Marketable debt securities – current (due in less than one year)	$	53,798	$	53,787	$	51,238	$	51,264
Marketable debt securities – non-current (due in one to two years)	28,532		28,502		38,635		38,642
	$	82,330	$	82,289	$	89,873	$	89,906

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