DERIVATIVE CONTRACTS AND COLLATERALIZED INDEBTEDNESS, Settlements of Collateralized Indebtedness (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 31, 2015
Settlements of Collateralized Indebtedness [Abstract]
Number of shares (in shares)	8,069,934	13,407,684
Collateralized indebtedness settled	$ (248,388)	$ (307,763)
Derivative contracts settled	(93,717)	(200,246)
Repayment of collateralized indebtedness and related derivative contracts	(342,105)	(508,009)	(218,754)
Proceeds from new monetization contracts	416,621	569,561	248,388
Net cash receipt	74,516	61,552
Prepaid forward contracts | Derivatives Not Designated as Hedging Instruments
Settlements of Collateralized Indebtedness [Abstract]
Reclassification of investment securities pledged as collateral from current assets to long-term assets	154,821
Reclassification of collateralized indebtedness from current liabilities to long-term liabilities	$ 103,227
Subsequent Event
Settlements of Collateralized Indebtedness [Abstract]
Number of shares (in shares)				2,668,875