FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details 3) (Discounted cash flow, Level 3, Assets at fair value on recurring basis)	6 Months Ended
	Jun. 30, 2013
Auction Rate Securities | Minimum
Quantitative information related to the significant unobservable inputs
Maximum rate probability (as a percent)	0.32%
Principal returned probability (as a percent)	76.95%
Default probability (as a percent)	3.97%
Liquidity risk (as a percent)	3.50%
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)	2.00%
Principal returned probability (as a percent)	95.33%
Default probability (as a percent)	22.72%
Liquidity risk (as a percent)	3.50%
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)	1.07%
Principal returned probability (as a percent)	86.49%
Default probability (as a percent)	12.44%
Liquidity risk (as a percent)	3.50%
Recovery rate (as a percent)	60.00%
Put Options | Minimum
Quantitative information related to the significant unobservable inputs
Counterparty risk (as a percent)	0.00%
Put Options | Maximum
Quantitative information related to the significant unobservable inputs
Counterparty risk (as a percent)	1.26%
Put Options | Weighted Average
Quantitative information related to the significant unobservable inputs
Counterparty risk (as a percent)	1.02%