MARKETABLE SECURITIES (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Current available-for-sale marketable securities
Amortized Cost	$ 117,131	$ 1,220
Gross Unrealized Gains	2,028	4,784
Gross Unrealized Losses	(110)	0
Marketable securities	119,049	6,004
Contractual maturities of debt securities classified as available-for-sale
Due in one year or less, amortized cost	46,160
Due after one year through five years, amortized cost	70,873
Total Amortized Cost	117,033
Due in one year or less, fair value	46,154
Due after one year through five years, fair value	70,787
Total, Estimated Fair Value	116,941
Total debt securities
Current available-for-sale marketable securities
Amortized Cost	117,033	1,004
Gross Unrealized Gains	18	4
Gross Unrealized Losses	(110)	0
Marketable securities	116,941	1,008
Corporate debt securities
Current available-for-sale marketable securities
Amortized Cost	117,033	1,004
Gross Unrealized Gains	18	4
Gross Unrealized Losses	(110)	0
Marketable securities	116,941	1,008
Equity securities
Current available-for-sale marketable securities
Amortized Cost	98	216
Gross Unrealized Gains	2,010	4,780
Gross Unrealized Losses	0	0
Marketable securities	$ 2,108	$ 4,996