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Supplemental Disclosures to the Financial Statements - Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Assets held for sale $ 32,326 $ 0
Prepaid expenses 25,024 3,592
Materials and supplies 9,711 11,666
Oil inventories 3,272 3,490
Other 226 652
Total other current assets $ 70,559 $ 19,400