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Commitments and Contingencies - Oil and Natural Gas Transportation and Throughput Agreements (Details) - Transportation and Throughput Agreements
$ in Thousands
Dec. 31, 2015
USD ($)
Years ending December 31  
2016 $ 14,082
2017 13,869
2018 14,163
2019 9,282
2020 1,584
Thereafter 11,088
Total future obligation $ 64,068