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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)

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