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Commitments and Contingencies - Future Transportation and Gathering Commitments (Details) - Transportation Agreement Obligation
$ in Thousands
Dec. 31, 2015
USD ($)
Other Commitments [Line Items]  
2016 $ 136,468
2017 178,699
2018 151,233
2019 139,387
2020 133,960
Thereafter 1,188,906
Future transportation agreement obligation $ 1,928,653