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DERIVATIVE AND HEDGING ACTIVITIES - (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Derivative and hedging activities
Asset derivative contracts	$ 1,843	$ 12,568
Liability derivative contracts	(86,560)	(26,416)
Derivatives not designated as hedging contracts
Derivative and hedging activities
Asset derivative contracts	1,843	12,568
Liability derivative contracts	(86,560)	(26,416)
Derivatives not designated as hedging contracts | Commodity contracts | Current assets - receivables from derivative contracts
Derivative and hedging activities
Asset derivative contracts	1,280	8,559
Derivatives not designated as hedging contracts | Commodity contracts | Other noncurrent assets - receivables from derivative contracts
Derivative and hedging activities
Asset derivative contracts	563	4,009
Derivatives not designated as hedging contracts | Commodity contracts | Current liabilities - liabilities from derivative contracts
Derivative and hedging activities
Liability derivative contracts	(71,443)	(22,125)
Derivatives not designated as hedging contracts | Commodity contracts | Other noncurrent liabilities - liabilities from derivative contracts
Derivative and hedging activities
Liability derivative contracts	$ (15,117)	$ (4,291)

X

- Definition

Fair value, before 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 elected not to be offset. Excludes assets not subject to a master netting arrangement.

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