HEDGES AND OTHER DERIVATIVE FINANCIAL INSTRUMENTS - Credit Default Swaps (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Credit Default Swap, Selling Protection
Derivatives, Fair Value [Line Items]
Maximum Payout Amounts By Contract Term	$ 269,800
Credit Default Swap, Selling Protection | 0-1 Year
Derivatives, Fair Value [Line Items]
Maximum Payout Amounts By Contract Term	269,800
Credit Default Swap, Selling Protection | 1-3 Years
Derivatives, Fair Value [Line Items]
Maximum Payout Amounts By Contract Term	0
Fair value of sell protection | Bank Loan | Credit Default Swap
Derivatives, Fair Value [Line Items]
Credit Default Swaps	3,115
Fair value of sell protection | Corporate Bond | Credit Default Swap
Derivatives, Fair Value [Line Items]
Credit Default Swaps	164
Fair value of sell protection | Bank Loan Swap Index | Credit Default Swap
Derivatives, Fair Value [Line Items]
Credit Default Swaps	92
Maximum potential future payments | Bank Loan | Credit Default Swap
Derivatives, Fair Value [Line Items]
Credit Default Swaps	221,700
Maximum potential future payments | Corporate Bond | Credit Default Swap
Derivatives, Fair Value [Line Items]
Credit Default Swaps	5,600
Maximum potential future payments | Bank Loan Swap Index | Credit Default Swap
Derivatives, Fair Value [Line Items]
Credit Default Swaps	42,500
Collateral held at third party | Bank Loan | Credit Default Swap
Derivatives, Fair Value [Line Items]
Credit Default Swaps	(20,503)
Collateral held at third party | Corporate Bond | Credit Default Swap
Derivatives, Fair Value [Line Items]
Credit Default Swaps	(196)
Collateral held at third party | Bank Loan Swap Index | Credit Default Swap
Derivatives, Fair Value [Line Items]
Credit Default Swaps	$ (3,040)