MARKETABLE SECURITITES (Tables)

3 Months Ended

Mar. 31, 2016

Marketable Securities [Abstract]

Available-for-sale Securities

Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at March 31, 2016, were as follows:

	Amortized Cost		Gross Unrealized					Estimated Fair Market Value
(In thousands)			Gains		Losses
Investments due in less than 3 months:
Corporate securities	$	14,443	$	4	$	(2	)	$	14,445
Total	14,443		4		(2		)	14,445
Investments due in 4-12 months:
Corporate securities	28,540		23		(6		)	28,557
Total	28,540		23		(6		)	28,557
Investments due between 12 months and 5-years:
Corporate securities	47,320		110		(13		)	47,417
Total	47,320		110		(13		)	47,417
Total marketable securities	$	90,303	$	137	$	(21	)	$	90,419

Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at December 31, 2015, were as follows:    

	Amortized Cost		Gross Unrealized					Estimated Fair Market Value
(In thousands)			Gains		Losses
Investments due in less than 3 months:
Corporate Securities	$	38,586	$	7	$	(10	)	$	38,583
Total	38,586		7		(10		)	38,583
Investments due in 4-12 months:
Corporate securities	33,654		1		(36		)	33,619
Total	33,654		1		(36		)	33,619
Investments due between 12 months and 5-years:
Corporate securities	11,626		—		(59		)	11,567
Total	11,626		—		(59		)	11,567
Total marketable securities	$	83,866	$	8	$	(105	)	$	83,769