MARKETABLE SECURITIES - SCHEDULE OF CURRENT AVAILABLE-FOR-SALE MARKETABLE SECURITIES (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Marketable Securities
Amortized Cost	$ 36,424	$ 159,516
Gross unrealized gain	2,963	1,387
Gross unrealized loss	(187)	(255)
Marketable securities	39,200	160,648
Amortized Cost
Due in one year or less	5,568
Due after one year through five years	22,197
Total	27,765
Fair Value
Due in one year or less	5,523
Due after one year through five years	22,055
Total	27,578
Corporate Debt Securities
Schedule of Available-for-sale Marketable Securities
Amortized Cost	27,765	159,418
Gross unrealized gain	0	34
Gross unrealized loss	(187)	(255)
Marketable securities	27,578	159,197
Equity Security
Schedule of Available-for-sale Marketable Securities
Amortized Cost	8,659	98
Gross unrealized gain	2,963	1,353
Gross unrealized loss	0	0
Marketable securities	$ 11,622	$ 1,451