Marketable Securities

6 Months Ended

Jun. 30, 2013

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, 2013
Marketable securities
U.S. government and municipal obligations
Maturing in one year or less	$	34,189	$	15	$	5	$	34,199
Maturing after one year through three years	34,030		61		22		34,069
Total U.S. government and municipal obligations	$	68,219	$	76	$	27	$	68,268
Corporate debt securities
Maturing in one year or less	$	33,336	$	10	$	32	$	33,314
Maturing after one year through three years	27,566		—		65		27,501
Total corporate debt securities	$	60,902	$	10	$	97	$	60,815
Total marketable securities	$	129,121	$	86	$	124	$	129,083
December 31, 2012
Marketable securities
U.S. government and municipal obligations
Maturing in one year or less	$	15,566	$	28	$	—	$	15,594
Maturing after one year through three years	19,797		99		1		19,895
Total U.S. government and municipal obligations	$	35,363	$	127	$	1	$	35,489
Corporate debt securities
Maturing in one year or less	$	17,353	$	23	$	4	$	17,372
Maturing after one year through three years	6,193		14		3		6,204
Total corporate debt securities	$	23,546	$	37	$	7	$	23,576
Total marketable securities	$	58,909	$	164	$	8	$	59,065

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, 2013.