Investments (Tables)

9 Months Ended

Sep. 29, 2012

Available-For-Sale Investments

The amortized cost and fair market values of available-for-sale investments are as follows at September 29, 2012 and December 31, 2011 (in thousands):

			Gross		Gross		Fair
	Amortized Cost		Unrealized Gains		Unrealized Losses		Market Value
September 29, 2012
Money market investments	$	2,473	$	—	$	—	$	2,473
Mortgage-backed securities		2,396		115		1		2,510
Corporate bonds and direct obligations of government agencies		68,962		1,395		6		70,351
U.S. Treasury obligations		16,792		51		—		16,843
Total	$	90,623	$	1,561	$	7	$	92,177
December 31, 2011
Money market investments	$	1,989	$	—	$	—	$	1,989
Mortgage-backed securities		3,017		61		18		3,060
Corporate bonds and direct obligations of government agencies		51,014		819		126		51,707
U.S. Treasury obligations		11,682		51		1		11,732
Total	$	67,702	$	931	$	145	$	68,488

Schedule of Unrealized Loss on Investments

For those available-for-sale investments with unrealized losses at September 29, 2012 and December 31, 2011, the following table summarizes the duration of the unrealized loss (in thousands):

	Less than 12 months				12 months or longer				Total
	Fair Market Value		Unrealized Loss		Fair Market Value		Unrealized Loss		Fair Market Value		Unrealized Loss
September 29, 2012
Mortgage-backed securities	$	131	$	1	$	—	$	—	$	131	$	1
Corporate bonds and direct obligations of government agencies		2,981		2		496		4		3,477		6
Total	$	3,112	$	3	$	496	$	4	$	3,608	$	7
December 31, 2011
Mortgage-backed securities	$	468	$	18	$	—	$	—	$	468	$	18
Corporate bonds and direct obligations of government agencies		6,067		126		—		—		6,067		126
U.S. Treasury obligations		591		1		—		—		591		1
Total	$	7,126	$	145	$	—	$	—	$	7,126	$	145