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Basis of presentation and significant accounting policies - Accounts receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Accounts receivable    
Oil, NGL and natural gas sales $ 135,560 $ 46,714
Joint operations, net 11,491 2,753
Sales of purchased oil and other products 4,756 5,083
Derivatives and other 0 9,426
Total accounts receivable, net 151,807 63,976
Allowance for doubtful accounts of accounts receivable for joint operations $ (400) $ (400)