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Commitments and Contingencies - Future Minimum Obligations under Transportation and Gathering Agreements (Details) - Transportation Agreement Obligation
$ in Thousands
Dec. 31, 2020
USD ($)
Other Commitments [Line Items]  
2021 $ 105,304
2022 191,455
2023 185,913
2024 179,772
2025 169,050
Thereafter 1,184,624
Future transportation agreement obligation $ 2,016,118