Quarterly report pursuant to Section 13 or 15(d)

Revenue (Revenues from Contracts with Customers) (Details)

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Revenue (Revenues from Contracts with Customers) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Carried interest recoupment $ 1,794 $ 280 $ 5,948 $ 1,273
Royalties (8,054) (2,704) (20,048) (8,449)
Total revenue, net 55,899 18,256 142,696 54,619
Sales Under COSPA [Member]        
Disaggregation of Revenue [Line Items]        
Sales under the COSPA 42,056 13,797 136,693 53,057
Gabonese Government Share Of Profit Oil [Member]        
Disaggregation of Revenue [Line Items]        
Sales under the COSPA $ 20,103 $ 6,883 $ 20,103 $ 8,738