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Commitments and Contingencies - Future Transportation and Gathering Commitments (Details) - Transportation Agreement Obligation
$ in Thousands
Dec. 31, 2018
USD ($)
Other Commitments [Line Items]  
2019 $ 100,703
2020 145,997
2021 159,286
2022 159,286
2023 142,943
Thereafter 954,740
Future transportation agreement obligation $ 1,662,955