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Commitments and Contingencies (Schedule of Future Minimum Transportation and Gathering Obligations) (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Contractual Obligation, Fiscal Year Maturity [Abstract]  
2017 $ 5,258
2018 4,476
2019 3,876
2020 1,830
2021 1,227
Thereafter 1,493
Total Contractual Obligation $ 18,160