Marketable Debt Securities

9 Months Ended

Sep. 28, 2013

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 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.

During the three and nine months ended September 28, 2013, respectively, $8.5 million and $31.8 million of marketable debt securities matured and were redeemed at face value. During the nine months ended September 29, 2012, $10.0 million of marketable debt securities matured and were redeemed at face value. There were no marketable debt securities redeemed during the three months ended September 29, 2012. During the nine months ended September 28, 2013, there were no other-than-temporary declines in market value.