Fair Value Measurements And Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2013

Fair Value Measurements And Marketable Securities [Abstract]

Schedule Of Fair Value Of Available-For-Sale Securities By Major Security Type

	March 31, 2013
	Level 1		Level 2		Level 3		Total
Bank certificates of deposit	$	—	$	2,441	$	—	$	2,441
U.S. government obligations		954		501		—		1,455
Corporate obligations		252		—		—		252
State and municipal bonds		—		353		—		353
	$	1,206	$	3,295	$	—	$	4,501

	December 31, 2012
	Level 1		Level 2		Level 3		Total
Bank certificates of deposit	$	—	$	2,524	$	—	$	2,524
U.S. government obligations		880		504		—		1,384
Corporate obligations		453		—		—		453
State and municipal bonds		—		456		—		456
	$	1,333	$	3,484	$	—	$	4,817