Investments (Tables)

3 Months Ended

Mar. 30, 2013

Available-For-Sale Investments

The amortized cost and fair values of available-for-sale investments are as follows at March 30, 2013 and December 29, 2012 (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
March 30, 2013
Money market investments	$	12,956	$	—	$	—	$	12,956
Mortgage-backed securities		2,094		61		—		2,155
Corporate bonds and direct obligations of government agencies		67,473		1,217		4		68,686
U.S. Treasury obligations		18,790		44		—		18,834
Total	$	101,313	$	1,322	$	4	$	102,631
December 29, 2012
Money market investments	$	2,865	$	—	$	—	$	2,865
Mortgage-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 Investments

For those available-for-sale investments with unrealized losses at March 30, 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
March 30, 2013
Corporate bonds and direct obligations of government agencies	$	4,184	$	4	$	—	$	—	$	4,184	$	4
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