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Prepaid and Other Current Assets | 3 Months Ended
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Mar. 31, 2024
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |
Prepaid and Other Current Assets | Prepaid and Other Current Assets Prepaid and other current assets at March 31, 2024 and December 31, 2023 consisted of the following (in thousands):
| March 31, 2024 |  | December 31, 2023
Advances to suppliers for crude purchases | $ | — |  |  | $ | 65,531 |
Collateral posted with broker for derivative instruments (1) | 5,855 |  |  | 21,763 |
Prepaid insurance | 13,521 |  |  | 20,235 |
Derivative assets | 16,230 |  |  | 43,356 |
Prepaid environmental credits | — |  |  | 20,756 |
Other | 12,714 |  |  | 10,764 |
Total | $ | 48,320 |  |  | $ | 182,405 |
_________________________________________________________ (1)Our cash margin that is required as collateral deposits on our commodity derivatives cannot be offset against the fair value of open contracts except in the event of default. Please read Note 12—Derivatives for further information.

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