DERIVATIVE CONTRACTS AND COLLATERALIZED INDEBTEDNESS, Settlements of Collateralized Indebtedness (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Settlements of Collateralized Indebtedness [Abstract]
Number of shares (in shares)	13,407,684	8,069,934
Collateralized indebtedness settled	$ (569,562)	$ (248,388)
Derivative contracts settled	(69,675)	(93,717)
Repayment of collateralized indebtedness and related derivative contracts	(639,237)	(342,105)	$ (508,009)
Proceeds from new monetization contracts	774,703	416,621	$ 569,561
Net cash receipt	$ 135,466	$ 74,516