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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)