Marketable Securities

6 Months Ended

Jun. 30, 2011

Marketable Securities

Marketable Securities

(6)  Marketable Securities

A summary of marketable securities is shown below:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
June 30, 2011
Marketable securities
U.S. government and municipal obligations
Maturing in one year or less	$	14,196	$	114	$	—		$	14,310
Maturing after one year through two years	21,679		74		(8		)	21,745
Total U.S. government and municipal obligations	$	35,875	$	188	$	(8	)	$	36,055
Corporate debt securities
Maturing in one year or less	$	19,039	$	7	$	(1	)	$	19,045
Maturing after one year through two years	5,309		5		(8		)	5,306
Total corporate debt securities	$	24,348	$	12	$	(9	)	$	24,351
Total marketable securities	$	60,223	$	200	$	(17	)	$	60,406

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
December 31, 2010
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

As of June 30, 2011, unrealized losses in the portfolio were primarily due to increases in interest rates. 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 June 30, 2011.