Investments (Tables)

6 Months Ended

Jun. 29, 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 June 29, 2013 and December 29, 2012 (in thousands):

			Gross		Gross
	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
June 29, 2013
Money market investments	$	860	$	—	$	—	$	860
Asset-backed securities		5,609		35		112		5,532
Corporate bonds and direct obligations of government agencies		76,297		740		517		76,520
U.S. Treasury obligations		18,782		37		14		18,805
Total	$	101,548	$	812	$	643	$	101,717
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 June 29, 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
June 29, 2013
Asset -backed securities	$	4,074	$	112	$	—	$	—	$	4,074	$	112
Corporate bonds and direct obligations of government agencies		33,801		517		—		—		33,801		517
U.S. Treasury obligations		755		14		—		—		755		14
Total	$	38,630	$	643	$	—	$	—	$	38,630	$	643
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