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Commitments and Contingencies - Future Minimum Obligations under Transportation and Gathering Agreements (Details) - Transportation Agreement Obligation
$ in Thousands
Dec. 31, 2019
USD ($)
Other Commitments [Line Items]  
2020 $ 100,165
2021 155,573
2022 158,947
2023 143,875
2024 136,378
Thereafter 823,210
Future transportation agreement obligation $ 1,518,148