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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details 3) (Level 3, Assets at fair value on recurring basis)
6 Months Ended
Jun. 30, 2012
Auction Rate Securities: Trading | Minimum | Discounted cash flow
 
Quantitative information related to the significant unobservable inputs  
Maximum rate probability (as a percent) 0.35%
Principal returned probability (as a percent) 86.51%
Default probability (as a percent) 3.98%
Liquidity risk (as a percent) 3.50%
Recovery rate (as a percent) 60.00%
Auction Rate Securities: Trading | Maximum | Discounted cash flow
 
Quantitative information related to the significant unobservable inputs  
Maximum rate probability (as a percent) 1.62%
Principal returned probability (as a percent) 95.54%
Default probability (as a percent) 12.14%
Liquidity risk (as a percent) 3.50%
Recovery rate (as a percent) 60.00%
Auction Rate Securities: Trading | Weighted Average | Discounted cash flow
 
Quantitative information related to the significant unobservable inputs  
Maximum rate probability (as a percent) 0.89%
Principal returned probability (as a percent) 87.55%
Default probability (as a percent) 11.57%
Liquidity risk (as a percent) 3.50%
Recovery rate (as a percent) 60.00%
Auction Rate Securities: Available-for-sale | Minimum | Market comparable bonds
 
Quantitative information related to the significant unobservable inputs  
Market price (as a percent) 54.00%
Auction Rate Securities: Available-for-sale | Maximum | Market comparable bonds
 
Quantitative information related to the significant unobservable inputs  
Market price (as a percent) 64.00%
Auction Rate Securities: Available-for-sale | Weighted Average | Market comparable bonds
 
Quantitative information related to the significant unobservable inputs  
Market price (as a percent) 60.00%
Put Options | Minimum | Discounted cash flow
 
Quantitative information related to the significant unobservable inputs  
Counterparty risk (as a percent) 1.92%
Put Options | Maximum | Discounted cash flow
 
Quantitative information related to the significant unobservable inputs  
Counterparty risk (as a percent) 2.69%
Put Options | Weighted Average | Discounted cash flow
 
Quantitative information related to the significant unobservable inputs  
Counterparty risk (as a percent) 2.31%