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Investments

Investments include primarily investment-grade corporate bonds and U.S. Treasury obligations having maturities of up to five years (the “bond portfolio”). Investments in the bond portfolio are reported as available-for-sale and are carried at fair value. Investments maturing less than one year from the balance sheet date are included in short-term investments and investments maturing more than one year from the balance sheet date are included in other assets in the consolidated balance sheets. Management performs an analysis of the nature of the unrealized losses on available-for-sale investments to determine whether such losses are other-than-temporary. Unrealized losses, representing the excess of the purchase price of an investment over its fair value as of the end of a period, considered to be other-than-temporary, are to be included as a charge in the statement of income, while unrealized losses considered to be temporary are to be included as a component of shareholders’ equity. Investments whose values are based on quoted market prices in active markets are classified within Level 1. Investments that trade in markets that are not considered to be active, but are valued based on quoted market prices, are classified within Level 2. As Level 2 investments include positions that are not traded in active markets, valuations may be adjusted to reflect illiquidity and/or non-transferability, which are generally based on available market information. Any transfers between levels are recognized as of the beginning of any reporting period. Fair value of the bond portfolio was determined using Level 1 inputs related to U.S. Treasury obligations and money market investments and Level 2 inputs related to investment-grade corporate bonds, asset-backed securities and direct obligations of government agencies. Unrealized gains, net of unrealized losses, on the investments in the bond portfolio were $516,000 and $163,000 at March 28, 2015 and December 27, 2014, respectively.

The amortized cost and fair values of available-for-sale investments are as follows at March 28, 2015 and December 27, 2014 (in thousands):


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
March 28, 2015

Money market investments	$	1,060	$	—	$	—	$	1,060
Asset-backed securities		5,078		2		22		5,058
Corporate bonds and direct obligations of government agencies		77,823		614		87		78,350
U.S. Treasury obligations		19,651		13		4		19,660


Total	$	103,612	$	629	$	113	$	104,128


December 27, 2014

Money market investments	$	1,729	$	—	$	—	$	1,729
Asset-backed securities		5,106		1		50		5,057
Corporate bonds and direct obligations of government agencies		76,964		491		284		77,171
U.S. Treasury obligations		19,507		14		9		19,512


Total	$	103,306	$	506	$	343	$	103,469

For those available-for-sale investments with unrealized losses at March 28, 2015 and December 27, 2014, the following table summarizes the duration of the unrealized loss (in thousands):


	Less than 12 months				12 months or longer				Total
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
March 28, 2015

Asset-backed securities	$	895	$	6	$	2,468	$	16	$	3,363	$	22
Corporate bonds and direct obligations of government agencies		2,561		59		6,707		28		9,268		87
U.S. Treasury obligations		4,903		3		766		1		5,669		4


Total	$	8,359		68	$	9,941	$	45	$	18,300	$	113


December 27, 2014

Asset-backed securities	$	2,006	$	13	$	2,447	$	37	$	4,453	$	50
Corporate bonds and direct obligations of government agencies		19,354		135		11,373		149		30,727		284
U.S. Treasury obligations		6,992		1		760		8		7,752		9


Total	$	28,352	$	149		14,580		194	$	42,932	$	343

The Company expects to recover the amortized cost basis of these securities as it does not intend to sell, and does not anticipate being required to sell, these securities before recovery of the cost basis. For these reasons, the Company does not consider the unrealized losses on these securities to be other-than-temporary at March 28, 2015.