DERIVATIVE CONTRACTS AND COLLATERALIZED INDEBTEDNESS, Impact and Location of Derivative Instruments within Consolidated Statements of Operations (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments, Gain (Loss) Recognized in Income [Abstract]
Gain on investment securities pledged as collateral	$ 129,832	$ 313,251	$ 293,599
Derivatives Not Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) Recognized in Income [Abstract]
Amount of Loss Recognized	(45,055)	(198,688)	(213,163)
Interest rate swap contracts | Loss on interest rate swap contracts, net | Derivatives Not Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) Recognized in Income [Abstract]
Amount of Loss Recognized	0	0	(1,828)
Prepaid forward contracts | Loss on equity derivative contracts, net | Derivatives Not Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) Recognized in Income [Abstract]
Amount of Loss Recognized	$ (45,055)	$ (198,688)	$ (211,335)