Marketable Debt Securities

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



	June 28, 2014
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
U.S. Treasury securities	$	23,978	$	24	$	(3	)	$	23,999
Corporate bonds	30,476		17		(2		)	30,491
U.S. Agency bonds	19,505		12		(4		)	19,513
Municipal bonds	9,623		27		—			9,650
	$	83,582	$	80	$	(9	)	$	83,653



	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):



	June 28, 2014				December 28, 2013
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Marketable debt securities – current (due in less than one year)	$	45,791	$	45,831	$	52,122	$	52,159
Marketable debt securities – non-current (due in one to two years)	37,791		37,822		34,648		34,632
	$	83,582	$	83,653	$	86,770	$	86,791

During the three months ended June 28, 2014 and June 29, 2013, respectively, $13.5 million and $17.5 million of marketable debt securities matured and were redeemed at face value. During the six months ended June 28, 2014 and June 29, 2013, respectively, $23.5 million and $23.3 million of marketable debt securities matured and were redeemed at face value. During the six months ended June 28, 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 June 28, 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.