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DERIVATIVE INSTRUMENTS (Derivative Instruments in Financial Position) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Short-term derivative asset | $ 53,188 | $ 126,201
Long-term derivative asset | 4,298 | 563
Short-term derivative liability | (8,540) | (303)
Long-term derivative liability | (45,615) | (53,135)
Total net asset derivative position | 3,331 | 73,326
Commodity Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Short-term derivative asset | 53,188 | 125,383
Long-term derivative asset | 4,298 | 0
Short-term derivative liability | (8,540) | (303)
Long-term derivative liability | (45,615) | (53,135)
Total net asset derivative position | 3,331 | 71,945
Contingent consideration arrangement |  |
Derivatives, Fair Value [Line Items] |  |
Short-term derivative asset |  | 818
Long-term derivative asset | 0 | 563
Total contingent consideration derivative position | $ 0 | $ 1,381

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