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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details 4) (USD $)
 12 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Auction rate securities
Dec. 31, 2013
2011 ARS Agreement
Dec. 31, 2012
2011 ARS Agreement
Dec. 31, 2011
2011 ARS Agreement
Jun. 30, 2011
2011 ARS Agreement
Sep. 30, 2014
2011 ARS Agreement
Subsequent event
Sep. 30, 2014
Put option related to auction rate securities
Sep. 30, 2014
2011 Put Option
Sep. 30, 2013
2011 Put Option
Sep. 30, 2014
2011 Put Option
Sep. 30, 2013
2011 Put Option
Oct. 01, 2013
2011 Put Option
Maximum
Jul. 01, 2013
2011 Put Option
Maximum
ARS Agreement                              
Face value of investments     $ 5,200,000                        
Impairment of investments, trading securities     400,000                        
Amortized Cost 616,460,000 412,039,000 4,800,000                        
Trading auction rate securities, in short-term and long-term investments     4,800,000                        
Amount of securities of par value             24,500,000             1,000,000 1,000,000
Redemption of investment securities through the exercise of the put option                 12,100,000            
Redemption of investment securities at par through normal market channels       2,300,000 1,300,000 3,700,000   1,000,000              
Fair market value of investments                   300,000   300,000      
Resulted (loss) gain on revaluation of investment securities included in other income (expense)                   $ (30,000) $ (40,000) $ (40,000) $ 2,700,000