Marketable Securities

3 Months Ended

Mar. 31, 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)
March 31, 2013
Marketable securities
U.S. government and municipal obligations
Maturing in one year or less	$	21,016	$	30	$	—	$	21,046
Maturing after one year through three years	17,470		84		1		17,553
Total U.S. government and municipal obligations	$	38,486	$	114	$	1	$	38,599
Corporate debt securities
Maturing in one year or less	$	23,909	$	24	$	10	$	23,923
Maturing after one year through three years	44,253		6		31		44,228
Total corporate debt securities	$	68,162	$	30	$	41	$	68,151
Total marketable securities	$	106,648	$	144	$	42	$	106,750
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 March 31, 2013.