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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details 3) (Discounted cash flow, Level 3, Assets at fair value on recurring basis)
 12 Months Ended
Dec. 31, 2013
Auction Rate Securities | Minimum
  
Quantitative information related to the significant unobservable inputs  
Maximum rate probability (as a percent) 0.57%
Principal returned probability (as a percent) 85.84%
Default probability (as a percent) 4.18%
Liquidity risk (as a percent) 3.00%
Recovery rate (as a percent) 60.00%
Auction Rate Securities | Maximum
  
Quantitative information related to the significant unobservable inputs  
Maximum rate probability (as a percent) 2.30%
Principal returned probability (as a percent) 94.93%
Default probability (as a percent) 12.08%
Liquidity risk (as a percent) 3.00%
Recovery rate (as a percent) 60.00%
Auction Rate Securities | Weighted Average
  
Quantitative information related to the significant unobservable inputs  
Maximum rate probability (as a percent) 1.34%
Principal returned probability (as a percent) 87.13%
Default probability (as a percent) 11.53%
Liquidity risk (as a percent) 3.00%
Recovery rate (as a percent) 60.00%
Put Options | Minimum
  
Quantitative information related to the significant unobservable inputs  
Counterparty risk (as a percent) 0.47%
Put Options | Maximum
  
Quantitative information related to the significant unobservable inputs  
Counterparty risk (as a percent) 0.76%
Put Options | Weighted Average
  
Quantitative information related to the significant unobservable inputs  
Counterparty risk (as a percent) 0.59%