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FAIR VALUE - HIERARCHY (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other | $ 1,857 | $ 1,706
Total assets at fair value | 56,003 | 34,235
Total liabilities at fair value | 62,060 | 76,444
Physical commodity contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 15,185 | 8,624
Liabilities | 37,790 | 40,426
Financial commodity contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 38,946 | 23,904
Liabilities | 24,146 | 35,732
Foreign currency contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 15 | 1
Liabilities | 124 | 286
Quoted Prices in Active Markets for Identical Assets, (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other | 1,857 | 1,706
Total assets at fair value | 37,449 | 21,734
Total liabilities at fair value | 24,032 | 35,732
Quoted Prices in Active Markets for Identical Assets, (Level 1) | Physical commodity contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 0 | 0
Liabilities | 0 | 0
Quoted Prices in Active Markets for Identical Assets, (Level 1) | Financial commodity contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 35,592 | 20,028
Liabilities | 24,032 | 35,732
Quoted Prices in Active Markets for Identical Assets, (Level 1) | Foreign currency contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 0 | 0
Liabilities | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other | 0 | 0
Total assets at fair value | 18,554 | 12,501
Total liabilities at fair value | 38,028 | 40,712
Significant Other Observable Inputs (Level 2) | Physical commodity contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 15,185 | 8,624
Liabilities | 37,790 | 40,426
Significant Other Observable Inputs (Level 2) | Financial commodity contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 3,354 | 3,876
Liabilities | 114 | 0
Significant Other Observable Inputs (Level 2) | Foreign currency contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 15 | 1
Liabilities | 124 | 286
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other | 0 | 0
Total assets at fair value | 0 | 0
Total liabilities at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Physical commodity contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 0 | 0
Liabilities | 0 | 0
Significant Unobservable Inputs (Level 3) | Financial commodity contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 0 | 0
Liabilities | 0 | 0
Significant Unobservable Inputs (Level 3) | Foreign currency contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 0 | 0
Liabilities | $ 0 | $ 0

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