MARKETABLE SECURITITES (Tables)

9 Months Ended

Sep. 30, 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 September 30, 2016, were as follows:

	Amortized Cost		Gross Unrealized					Estimated Fair Market Value
(In thousands)			Gains		Losses
Investments due in less than 3 months:
Commercial paper	$	1,497	$	—	$	—		$	1,497
Corporate securities	5,001		—		—			5,001
Total	6,498		—		—			6,498
Investments due in 4-12 months:
Commercial paper	45,354		—		—			45,354
Corporate securities	51,558		27		(7		)	51,578
Total	96,912		27		(7		)	96,932
Investments due between 12 months and 5 years:
Corporate securities	27,244		41		(42		)	27,243
Total	27,244		41		(42		)	27,243
Total marketable securities	$	130,654	$	68	$	(49	)	$	130,673

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