MARKETABLE SECURITIES (Tables)

12 Months Ended

Dec. 31, 2015

MARKETABLE SECURITIES

Summary of marketable securities

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
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
December 31, 2015
Marketable securities
U.S. government and municipal obligations
Maturing in one year or less	$	48,871	$	4	$	(20	)	$	48,855
Maturing after one year through three years		15,940		24		(57	)		15,907
Total U.S. government and municipal obligations	$	64,811	$	28	$	(77	)	$	64,762
Corporate debt securities
Maturing in one year or less	$	129,327	$	2	$	(141	)	$	129,188
Maturing after one year through three years		23,932		1		(102	)		23,831
Total corporate debt securities	$	153,259	$	3	$	(243	)	$	153,019
Total marketable securities	$	218,070	$	31	$	(320	)	$	217,781