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Joint Interest Billings and Long-term Receivables (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 28, 2019
USD ($)
agreement
Sep. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Aug. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Oil and Gas Joint Interest Billing Receivables [Line Items]          
Joint interest billings, net   $ 26,147 $ 26,147   $ 26,002
Long-term receivables   271,295 271,295   117,497
BP Operator          
Oil and Gas Joint Interest Billing Receivables [Line Items]          
Long-term investments and receivables, net       $ 200,200  
Settlement of payment obligation of capital expenditures   51,200      
Settlement of accounts payable   42,700      
National Oil Companies of Mauritania And Senegal | Carry Advance Agreements          
Oil and Gas Joint Interest Billing Receivables [Line Items]          
Long-term receivables   143,400 143,400   96,300
Number of agreements | agreement 2        
Share of development costs to be financed, up to $ 239,700        
Greater Tortue FPSO | BP Operator          
Oil and Gas Joint Interest Billing Receivables [Line Items]          
Contract liability, noncurrent   200,200 200,200 $ 200,200  
TEN Discoveries | GNPC          
Oil and Gas Joint Interest Billing Receivables [Line Items]          
Joint interest billings, net   5,800 5,800   5,800
Long-term receivables   $ 21,600 $ 21,600   $ 21,200
GNPC | TEN Discoveries          
Oil and Gas Joint Interest Billing Receivables [Line Items]          
GNPC's paying interest     5.00%