FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details 3) (Level 3, Assets at fair value on recurring basis)	9 Months Ended
	Sep. 30, 2012
Auction Rate Securities: Trading | Minimum | Discounted cash flow
Quantitative information related to the significant unobservable inputs
Maximum rate probability (as a percent)	0.37%
Principal returned probability (as a percent)	86.66%
Default probability (as a percent)	3.88%
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)	1.67%
Principal returned probability (as a percent)	95.61%
Default probability (as a percent)	11.86%
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)	0.91%
Principal returned probability (as a percent)	87.72%
Default probability (as a percent)	11.36%
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)	1.40%
Put Options | Maximum | Discounted cash flow
Quantitative information related to the significant unobservable inputs
Counterparty risk (as a percent)	1.99%
Put Options | Weighted Average | Discounted cash flow
Quantitative information related to the significant unobservable inputs
Counterparty risk (as a percent)	1.74%