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DERIVATIVE AND HEDGING ACTIVITIES - Location in Balance Sheets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Derivative and hedging activities
Asset derivative contracts	$ 15,468	$ 69,717
Liability derivative contracts	(16,062)	(12,907)
Derivatives not designated as hedging contracts
Derivative and hedging activities
Asset derivative contracts	15,468	69,717
Liability derivative contracts	(16,062)	(12,907)
Derivatives not designated as hedging contracts | Commodity contracts | Current assets - receivables from derivative contracts
Derivative and hedging activities
Asset derivative contracts	10,648	57,280
Derivatives not designated as hedging contracts | Commodity contracts | Other noncurrent assets - receivables from derivative contracts
Derivative and hedging activities
Asset derivative contracts	4,820	12,437
Derivatives not designated as hedging contracts | Commodity contracts | Current liabilities - liabilities from derivative contracts
Derivative and hedging activities
Liability derivative contracts	(11,814)	(3,768)
Derivatives not designated as hedging contracts | Commodity contracts | Other noncurrent liabilities - liabilities from derivative contracts
Derivative and hedging activities
Liability derivative contracts	$ (4,248)	$ (9,139)

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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