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Derivatives - Open Commodity Derivative Contracts (Details) - July 2016 - December 2016
6 Months Ended
Jun. 30, 2016
$ / Mcf
$ / bbl
MBbls
Mcf
Oil price swaps  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) | MBbls 552,000
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) | $ / bbl 88.40
Natural gas basis swaps  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) | Mcf 1,840,000
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) | $ / Mcf (0.38)