Investments (Tables)

12 Months Ended

Dec. 26, 2015

Amortized Cost and Fair Value of Available for Sale Investments

The amortized cost and fair values of available-for-sale investments are as follows at December 26, 2015 and December 27, 2014 (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
December 26, 2015
Money market investments	$	7,594	$	—	$	—	$	7,594
Asset-backed securities		4,523		1		58		4,466
Corporate bonds and direct obligations of government agencies		76,839		190		270		76,759
U.S. Treasury obligations		19,273		5		13		19,265
Total	$	108,229	$	196	$	341	$	108,084
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

Schedule of Unrealized Loss on Available for Sale Investments

For those available-for-sale investments with unrealized losses at December 26, 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
December 26, 2015
Asset-backed securities	$	4,422	$	58	$	—	$	—	$	4,422	$	58
Corporate bonds and direct obligations of government agencies		39,276		217		562		53		39,838		270
U.S. Treasury obligations		15,093		13		—		—		15,093		13
Total	$	58,791	$	288	$	562	$	53	$	59,353	$	341
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