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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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