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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details 4) (USD $) | 3 Months Ended | 9 Months Ended |  |  | 9 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Mar. 31, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011 | Sep. 30, 2012 Auction rate securities | Sep. 30, 2012 2011 ARS Agreement | Dec. 31, 2011 2011 ARS Agreement | Jun. 30, 2011 2011 ARS Agreement | Dec. 31, 2011 2010 ARS Agreement | Mar. 31, 2010 2010 ARS Agreement | Oct. 01, 2013 2011 Put Option | Jul. 01, 2013 2011 Put Option | Sep. 30, 2012 2011 Put Option | Mar. 31, 2012 2010 Put Option
ARS Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face value of investments |  |  |  |  |  |  | $ 28,000,000 |  |  |  |  |  |  |  |  |
Amortized Cost | 327,536,000 |  |  | 327,536,000 |  | 434,476,000 | 20,800,000 |  |  |  |  |  |  |  |  |
Fair value of available-for-sale securities |  |  |  |  |  |  | 3,300,000 |  |  |  |  |  |  |  |  |
Impairment of investments available-for-sale |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |
Trading auction rate securities, in short-term and long-term investments |  |  |  |  |  |  | 17,400,000 |  |  |  |  |  |  |  |  |
Impairment of investments, trading securities |  |  |  |  |  |  | 2,300,000 |  |  |  |  |  |  |  |  |
Amount of securities of par value |  |  |  |  |  |  |  |  |  | 24,500,000 |  | 54,200,000 | 1,000,000 | 1,000,000 |  |
Redemption of investment securities at par through normal market channels |  |  |  |  |  |  |  | 1,000,000 | 3,700,000 |  | 38,500,000 |  |  |  |  |
Fair market value of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,900,000 |
Redemption of investment securities through the exercise of the put option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,700,000
Resulted gain or loss on revaluation of investment securities included in other income | $ 200,000 | $ (800,000) | $ (800,000) | $ 600,000 | $ (800,000) |  |  |  |  |  |  |  |  |  |  |

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