Investments (Tables)

9 Months Ended

Sep. 28, 2013

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 September 28, 2013 and December 29, 2012 (in thousands):

			Gross		Gross
	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
September 28, 2013
Money market investments	$	1,172	$	—	$	—	$	1,172
Asset-backed securities		4,436		25		73		4,388
Corporate bonds and direct obligations of government agencies		77,439		798		332		77,905
U.S. Treasury obligations		18,790		38		10		18,818
Total	$	101,837	$	861	$	415	$	102,283
December 29, 2012
Money market investments	$	2,865	$	—	$	—	$	2,865
Asset-backed securities		2,175		73		—		2,248
Corporate bonds and direct obligations of government agencies		69,173		1,294		6		70,461
U.S. Treasury obligations		16,782		47		1		16,828
Total	$	90,995	$	1,414	$	7	$	92,402

Schedule of Unrealized Loss on Available for Sale Investments

For those available-for-sale investments with unrealized losses at September 28, 2013 and December 29, 2012, 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
September 28, 2013
Asset -backed securities	$	3,456	$	73	$	—	$	—	$	3,456	$	73
Corporate bonds and direct obligations of government agencies		24,792		332		—		—		24,792		332
U.S. Treasury obligations		759		10		—		—		759		10
Total	$	29,007	$	415	$	—	$	—	$	29,007	$	415
December 29, 2012
Corporate bonds and direct obligations of government agencies	$	3,387	$	6	$	—	$	—	$	3,387	$	6
U.S. Treasury obligations		770		1		—		—		770		1
Total	$	4,157	$	7	$	—	$	—	$	4,157	$	7