FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details 3) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Oct. 02, 2013	Jul. 02, 2013	Jun. 30, 2011
ARS Agreement
Amortized Cost	$ 1,287,222	$ 824,074
Auction rate securities
ARS Agreement
Face value of investments	3,400
Amortized Cost	3,200
Trading auction rate securities, in short-term and long-term investments	3,200
Impairment of investments, trading securities	200
2011 ARS Agreement
ARS Agreement
Amount of securities of par value								$ 24,500
Redemption of investment securities at par through normal market channels	700	$ 13,100	$ 2,300	$ 1,300	$ 3,700
Put options
ARS Agreement
Redemption of investment securities through the exercise of the put option	1,700
2011 Put Option
ARS Agreement
Fair market value of investments	$ 200
2011 Put Option | Maximum
ARS Agreement
Amount of securities of par value						$ 1,000	$ 1,000