Marketable Securities

9 Months Ended

Sep. 30, 2011

Marketable Securities

Marketable Securities

(6)  Marketable Securities

A summary of marketable securities is shown below:

September 30, 2011	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
Marketable securities
U.S. government and municipal obligations
Maturing in one year or less	$	24,855	$	47	$	(3	)	$	24,899
Maturing after one year through two years	6,656		103		—			6,759
Total U.S. government and municipal obligations	$	31,511	$	150	$	(3	)	$	31,658
Corporate debt securities
Maturing in one year or less	$	12,248	$	3	$	(1	)	$	12,250
Maturing after one year through two years	5,852		1		(84		)	5,769
Total corporate debt securities	$	18,100	$	4	$	(85	)	$	18,019
Total marketable securities	$	49,611	$	154	$	(88	)	$	49,677

December 31, 2010	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
Marketable securities
U.S. government and municipal obligations
Maturing in one year or less	$	14,836	$	35	$	—		$	14,871
Maturing after one year through two years	11,428		103		—			11,531
Total U.S. government and municipal obligations	$	26,264	$	138	$	—		$	26,402
Corporate debt securities
Maturing in one year or less	$	11,798	$	18	$	(2	)	$	11,814
Maturing after one year through two years	1,594		1		—			1,595
Total corporate debt securities	$	13,392	$	19	$	(2	)	$	13,409
Total marketable securities	$	39,656	$	157	$	(2	)	$	39,811

The marketable securities held by the Company were high investment grade and there were no marketable securities that the Company considered to be other-than-temporarily impaired as of September 30, 2011.