Marketable Debt Securities

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



	March 29, 2014
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
U.S. Treasury securities	$	23,979	$	19	$	—		$	23,998
Corporate bonds	30,669		5		(15		)	30,659
U.S. Agency bonds	19,516		10		(6		)	19,520
Municipal bonds	8,414		25		—			8,439
	$	82,578	$	59	$	(21	)	$	82,616



	December 28, 2013
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
U.S. Treasury securities	$	23,975	$	15	$	(1	)	$	23,989
Corporate bonds	35,804		3		(23		)	35,784
U.S. Agency bonds	19,517		10		(4		)	19,523
Municipal bonds	7,474		23		(2		)	7,495
	$	86,770	$	51	$	(30	)	$	86,791

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



	March 29, 2014				December 28, 2013
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Marketable debt securities – current (due in less than one year)	$	52,112	$	52,147	$	52,122	$	52,159
Marketable debt securities – non-current (due in one to two years)	30,466		30,469		34,648		34,632
	$	82,578	$	82,616	$	86,770	$	86,791

During the three months ended March 29, 2014 and March 30, 2013, respectively, $10.0 million and $5.8 million of marketable debt securities matured and were redeemed at face value. During the three months ended March 29, 2014, there were no other-than-temporary declines in market value.

Other Investments

During 2013, we made a minority equity investment in one of our strategic product-development partners. The carrying value of this investment at March 29, 2014 and December 28, 2013 using the cost method is $4.5 million and is included in other assets on our condensed consolidated balance sheets.