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Financial Instruments - Summary of Additional Information Related to Financial Instruments Measured at Fair Value on Recurring Basis (Details) - Fair Value on Recurring Basis - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Liabilities:    
Total net liability $ (67,814) $ (11,594)
Oil And Natural Gas Swaps And Costless Collars    
Assets:    
Oil and natural gas swaps and costless collars 7,821 8,393
Liabilities:    
Oil and natural gas swaps and costless collars (75,635) (19,987)
Level 2    
Liabilities:    
Total net liability (67,814) (11,594)
Level 2 | Oil And Natural Gas Swaps And Costless Collars    
Assets:    
Oil and natural gas swaps and costless collars 7,821 8,393
Liabilities:    
Oil and natural gas swaps and costless collars $ (75,635) $ (19,987)