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Commitments and Contingencies - Future Transportation and Gathering Commitments (Details) - Transportation Agreement Obligation
$ in Thousands
Dec. 31, 2017
USD ($)
Other Commitments [Line Items]  
2018 $ 105,478
2019 163,017
2020 157,654
2021 157,224
2022 157,224
Thereafter 1,004,087
Future transportation agreement obligation $ 1,744,684