Investments (Tables)

9 Months Ended

Sep. 24, 2011

Investments

Available-For-Sale Investments

			Gross		Gross		Fair
	Amortized Cost		Unrealized Gains		Unrealized Losses		Market Value
September 24, 2011
Money market investments	$	2,526	$	—	$	—	$	2,526
Mortgage-backed securities		3,057		36		22		3,071
Corporate bonds and direct obligations of government agencies		53,150		997		73		54,074
U.S. Treasury obligations		10,506		52		—		10,558
Total	$	69,239	$	1,085	$	95	$	70,229
December 25, 2010
Money market investments	$	535	$	—	$	—	$	535
Mortgage-backed securities		3,458		64		8		3,514
Corporate bonds and direct obligations of government agencies		60,330		872		151		61,051
U.S. Treasury obligations		12,584		6		23		12,567
Total	$	76,907	$	942	$	182	$	77,667

Schedule Of Unrealized Loss On Investments

	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 24, 2011
Mortgage-backed securities	$	1,405	$	22	$	—	$	—	$	1,405	$	22
Corporate bonds and direct obligations of government agencies		3,512		73		—		—		3,512		73
Total	$	4,917	$	95	$	—	$	—	$	4,917	$	95
December 25, 2010
Mortgage-backed securities	$	225	$	8	$	—	$	—	$	225	$	8
Corporate bonds and direct obligations of government agencies		11,615		151		—		—		11,615		151
U.S. Treasury obligations		774		23		—		—		774		23
Total	$	12,614	$	182	$	—	$	—	$	12,614	$	182