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Commitments - Schedule of Firm Transportation Contracts (Details) - Transportation commitment
$ in Thousands
Dec. 31, 2018
USD ($)
Other Commitments [Line Items]  
2019 $ 251,644
2020 247,581
2021 246,620
2022 246,620
2023 244,352
Thereafter 2,267,501
Total $ 3,504,318