Marketable Securities

6 Months Ended

Jun. 30, 2012

Marketable Securities

Marketable Securities

(5)  Marketable Securities

A summary of marketable securities is shown below:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(In thousands)
June 30, 2012
Marketable securities
U.S. government and municipal obligations
Maturing in one year or less	$	21,973	$	27	$	4	$	21,996
Maturing after one year through three years	15,543		99		1		15,641
Total U.S. government and municipal obligations	$	37,516	$	126	$	5	$	37,637
Corporate debt securities
Maturing in one year or less	$	19,156	$	19	$	4	$	19,171
Maturing after one year through three years	3,303		6		8		3,301
Total corporate debt securities	$	22,459	$	25	$	12	$	22,472
Total marketable securities	$	59,975	$	151	$	17	$	60,109
December 31, 2011
Marketable securities
U.S. government and municipal obligations
Maturing in one year or less	$	19,993	$	20	$	—	$	20,013
Maturing after one year through three years	10,808		122		6		10,924
Total U.S. government and municipal obligations	$	30,801	$	142	$	6	$	30,937
Corporate debt securities
Maturing in one year or less	$	5,817	$	3	$	4	$	5,816
Maturing after one year through three years	4,730		2		72		4,660
Total corporate debt securities	$	10,547	$	5	$	76	$	10,476
Total marketable securities	$	41,348	$	147	$	82	$	41,413

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, 2012.