MARKETABLE SECURITIES (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014 investment	Sep. 30, 2013	Sep. 30, 2014 investment	Sep. 30, 2013	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	33		33
Marketable securities	$ 119,049		$ 119,049		$ 6,004
Available-for-sale Securities, Gross Unrealized Loss			(110)		0
Proceeds from maturities and sales of current and non-current available-for-sale marketable securities and related gross realized gains and losses
Proceeds from maturities and sales of available-for-sale marketable securities	1,114	41,976	4,576	54,478
Available-for-sale Securities, Gross Realized Gains	1,063	17,977	3,362	17,977
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	72,643		72,643		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss			(110)		0
Marketable securities	116,941		116,941		1,008
Available-for-sale Securities, Gross Unrealized Loss			(110)		0
Total
Schedule of Available-for-sale Securities [Line Items]
Marketable securities	72,643		72,643		0
Available-for-sale Securities, Gross Unrealized Loss			$ (110)		$ 0