MARKETABLE SECURITITES (Tables)

6 Months Ended

Jun. 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 June 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	$	8,189	$	—	$	—		$	8,189
Corporate securities	14,027		—		(3		)	14,024
Total	22,216		—		(3		)	22,213
Investments due in 4-12 months:
Commercial paper	8,309		—		—			8,309
Corporate securities	33,591		50		—			33,641
Total	41,900		50		—			41,950
Investments due between 12 months and 5 years:
Corporate securities	32,611		117		—			32,728
Total	32,611		117		—			32,728
Total marketable securities	$	96,727	$	167	$	(3	)	$	96,891

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