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Prepaid and Other Current Assets
 6 Months Ended
Jun. 30, 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 June 30, 2024 and December 31, 2023 consisted of the following (in thousands):
June 30, 2024December 31, 2023
Advances to suppliers for crude purchases$— $65,531 
Collateral posted with broker for derivative instruments (1)2,353 21,763 
Prepaid insurance6,837 20,235 
Derivative assets24,539 43,356 
Prepaid environmental credits1,400 20,756 
Other16,588 10,764 
Total$51,717 $182,405 
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(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.