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INVENTORIES AND SUPPLIES (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Inventory [Line Items] |  |
Inventories and supplies | $ 219,499 | $ 220,498
Oil and oil related products |  |
Inventory [Line Items] |  |
Inventories and supplies | 76,106 | 76,209
Supplies |  |
Inventory [Line Items] |  |
Inventories and supplies | 120,814 | 120,007
Solvent and solutions |  |
Inventory [Line Items] |  |
Inventories and supplies | 9,145 | 8,812
Other |  |
Inventory [Line Items] |  |
Inventories and supplies | $ 13,434 | $ 15,470

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