Investments (Tables)

3 Months Ended

Mar. 26, 2016

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 March 26, 2016 and December 26, 2015 (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
March 26, 2016
Money market investments	$	8,526	$	—	$	—	$	8,526
Asset-backed securities		4,519		2		61		4,460
Corporate bonds and direct obligations of government agencies		76,398		327		137		76,588
U.S. Treasury obligations		19,210		10		4		19,216
Total	$	108,653	$	339	$	202	$	108,790
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

Schedule of Unrealized Loss on Available for Sale Investments

For those available-for-sale investments with unrealized losses at March 26, 2016 and December 26, 2015, 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 26, 2016
Asset-backed securities	$	1,684	$	11	$	2,428	$	50	$	4,112	$	61
Corporate bonds and direct obligations of government agencies		20,974		51		3,868		86		24,842		137
U.S. Treasury obligations		12,042		4		—		—		12,042		4
Total	$	34,700	$	66	$	6,296	$	136	$	40,996	$	202
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