DERIVATIVE CONTRACTS AND COLLATERALIZED INDEBTEDNESS, Location of Assets and Liabilities with the Consolidated Balance Sheets (Details) - Designated as Hedging Instruments - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Derivative Instruments, Fair Value [Abstract]
Asset Derivatives	$ 38,768	$ 82,408
Liability Derivatives	7,078	2,706
Prepaid forward contracts | Current derivative contracts
Derivative Instruments, Fair Value [Abstract]
Asset Derivatives	7,307	10,333
Liability Derivatives	7,078	2,706
Prepaid forward contracts | Long-term derivative contracts
Derivative Instruments, Fair Value [Abstract]
Asset Derivatives	31,461	72,075
Liability Derivatives	$ 0	$ 0