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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details 4) (USD $)
 12 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 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
Mar. 31, 2014
2011 ARS Agreement
Subsequent event
Mar. 31, 2014
Put option related to auction rate securities
Mar. 31, 2014
2011 Put Option
Mar. 31, 2013
2011 Put Option
Oct. 02, 2013
2011 Put Option
Maximum
Jul. 02, 2013
2011 Put Option
Maximum
ARS Agreement                          
Face value of investments     $ 15,500,000                    
Amortized Cost 447,063,000 412,039,000 14,500,000                    
Trading auction rate securities, in short-term and long-term investments     14,500,000                    
Impairment of investments, trading securities     1,000,000                    
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                 1,700,000        
Redemption of investment securities at par through normal market channels       2,300,000 1,300,000 3,700,000   1,700,000          
Fair market value of investments                   1,000,000      
Resulted (loss) gain on revaluation of investment securities included in other income (expense)                   $ (1,000) $ 2,600,000