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FINANCIAL INSTRUMENTS - Fair Values of Derivative Instruments on a Gross Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2017
Derivative [Line Items]
Derivative asset	$ 540	$ 46,970
Derivative liability	(45,625)	(56,205)
Oil derivative instrument
Derivative [Line Items]
Derivative asset	540	45,640
Derivative liability			$ (79,600)
Foreign exchange swap
Derivative [Line Items]
Derivative asset	0	214
Foreign exchange swaps	0	1,246
Net amount	(1,310)	0
Interest rate swap
Derivative [Line Items]
Derivative asset	0	84
Derivative liability	(44,315)	(5,798)
Equity Swap
Derivative [Line Items]
Derivative liability	$ 0	$ (50,407)

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- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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