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DERIVATIVE INSTRUMENTS (Derivative Instruments in Financial Position) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Short-term derivative asset | $ 12,422 | $ 27,146
Long-term derivative asset | 652 | 322
Short-term derivative liability | (20,687) | (11,641)
Long-term derivative liability | (43,267) | (36,604)
Commodity Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Short-term derivative asset | 12,422 | 27,146
Long-term derivative asset | 652 | 322
Short-term derivative liability | (20,687) | (11,641)
Long-term derivative liability | (43,267) | (36,604)
Total net (liability) asset derivative position | $ (50,880) | $ (20,777)

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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, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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