Marketable Securities

3 Months Ended

Mar. 31, 2015

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, 2015
Marketable securities
U.S. government and municipal obligations
Maturing in one year or less	$	51,907	$	27	$	(3	)	$	51,931
Maturing after one year through three years	8,914		38		—			8,952
Total U.S. government and municipal obligations	$	60,821	$	65	$	(3	)	$	60,883
Corporate debt securities
Maturing in one year or less	$	114,200	$	22	$	(65	)	$	114,157
Maturing after one year through three years	62,562		31		(30		)	62,563
Total corporate debt securities	$	176,762	$	53	$	(95	)	$	176,720
Total marketable securities	$	237,583	$	118	$	(98	)	$	237,603
December 31, 2014
Marketable securities
U.S. government and municipal obligations
Maturing in one year or less	$	44,580	$	30	$	(6	)	$	44,604
Maturing after one year through three years	16,108		49		(1		)	16,156
Total U.S. government and municipal obligations	$	60,688	$	79	$	(7	)	$	60,760
Corporate debt securities
Maturing in one year or less	$	89,636	$	6	$	(37	)	$	89,605
Maturing after one year through three years	22,690		3		(35		)	22,658
Total corporate debt securities	$	112,326	$	9	$	(72	)	$	112,263
Total marketable securities	$	173,014	$	88	$	(79	)	$	173,023

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, 2015.  Marketable securities include $1.3 million and $1.4 million in accrued interest at March 31, 2015 and December 31, 2014, respectively.