DERIVATIVE CONTRACTS AND COLLATERALIZED INDEBTEDNESS, Location of Assets and Liabilities with the Consolidated Balance Sheets (Details) - Derivatives Not Designated as Hedging Instruments - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments, Fair Value [Abstract]
Asset Derivatives	$ 82,408	$ 7,317
Liability Derivatives	2,706	102,217
Prepaid forward contracts | Current derivative contracts
Derivative Instruments, Fair Value [Abstract]
Asset Derivatives	10,333	0
Liability Derivatives	2,706	93,010
Prepaid forward contracts | Long-term derivative contracts
Derivative Instruments, Fair Value [Abstract]
Asset Derivatives	72,075	7,317
Liability Derivatives	$ 0	$ 9,207