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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details 3) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 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	$ 1,579,065	$ 824,074
Auction rate securities
ARS Agreement
Face value of investments	1,540
Amortized Cost	1,490
Trading auction rate securities, in short-term and long-term investments	1,490
Impairment of investments, trading securities	50
2011 ARS Agreement
ARS Agreement
Amount of securities of par value								$ 24,500
Redemption of investment securities at par through normal market channels	2,600	13,100	$ 2,300	$ 1,300	$ 3,700
Put options
ARS Agreement
Redemption of investment securities through the exercise of the put option	1,500
2011 Put Option
ARS Agreement
Fair market value of investments	50
2011 Put Option | Maximum
ARS Agreement
Amount of securities of par value						$ 1,000	$ 1,000
Level 1
ARS Agreement
Fair market value of investments	818,249	303,018
Level 2
ARS Agreement
Fair market value of investments	1,999,476	887,217
Level 3
ARS Agreement
Fair market value of investments	1,535	4,160
Level 3 | Auction rate securities
ARS Agreement
Fair market value of investments	1,487	3,910
Level 3 | Put options
ARS Agreement
Fair market value of investments	48	250
Total fair value
ARS Agreement
Fair market value of investments	2,819,260	1,194,395
Total fair value | Auction rate securities
ARS Agreement
Fair market value of investments	1,487	3,910
Total fair value | Put options
ARS Agreement
Fair market value of investments	$ 48	$ 250

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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For investments which are quantified by principal amount, the principle balance held at close of period.

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The fair value of the open option contracts written for the investment.

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