MARKETABLE SECURITIES (Tables)

12 Months Ended

Dec. 31, 2016

Marketable Securities [Abstract]

Schedule of Current Available-for-sale Marketable Securities

At December 31, 2015, current available-for-sale marketable securities are as follows:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
Corporate debt securities	$	27,765	$	—	$	(187	)	$	27,578
Equity security	8,659		2,963		—			11,622
Total marketable securities	$	36,424	$	2,963	$	(187	)	$	39,200

At December 31, 2016, current available-for-sale marketable securities are as follows:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
Commercial paper	$	49,797	$	—	$	—		$	49,797
Treasury discount notes	34,978		—		(4		)	34,974
Corporate debt securities	4,575		2		(6		)	4,571
Total debt securities	89,350		2		(10		)	89,342
Total marketable securities	$	89,350	$	2	$	(10	)	$	89,342

Schedule of Proceeds from Maturities and Sales of Current Available-for-sale Marketable Securities

The following table presents the proceeds from maturities and sales of current and non-current available-for-sale marketable securities and the related gross realized gains:

	December 31,
	2016		2015		2014
	(In thousands)
Proceeds from maturities and sales of available-for-sale marketable securities	$	279,485	$	218,976	$	25,223
Gross realized gains	3,556		443		3,362