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Commitments and Contingencies - Future Transportation and Gathering Commitments (Details) - Transportation Agreement Obligation
$ in Thousands
Dec. 31, 2016
USD ($)
Other Commitments [Line Items]  
2017 $ 148,061
2018 167,749
2019 155,904
2020 150,522
2021 150,110
Thereafter 1,071,827
Future transportation agreement obligation $ 1,844,173