Marketable Securities

3 Months Ended

Mar. 31, 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)
March 31, 2012
Marketable securities
U.S. government and municipal obligations
Maturing in one year or less	$	20,637	$	28	$	—	$	20,665
Maturing after one year through three years	21,837		117		4		21,950
Total U.S. government and municipal obligations	$	42,474	$	145	$	4	$	42,615
Corporate debt securities
Maturing in one year or less	$	19,219	$	17	$	1	$	19,235
Maturing after one year through three years	7,508		24		8		7,524
Total corporate debt securities	$	26,727	$	41	$	9	$	26,759
Total marketable securities	$	69,201	$	186	$	13	$	69,374
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 Company classifies all of its marketable securities as current assets on the consolidated balance sheets because they are available-for-sale and available to fund current operations. 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 March 31, 2012.