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Derivatives - Open Commodity Derivative Contracts (Details)
 9 Months Ended
Sep. 30, 2016
$ / Mcf
$ / bbl
MBbls
Mcf
Oil Price Swaps, October 2016 - December 2016  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) | MBbls 1,288
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) | $ / bbl 56.45
Oil Price Swaps, January 2017 - December 2017  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) | MBbls 1,825
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) | $ / bbl 50.51
Natural Gas Price Swaps, October 2016 - December 2016  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) | Mcf 10,920
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) | $ / Mcf 2.86
Natural Gas Price Swaps, January 2017 - December 2017  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) | Mcf 18,250
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) | $ / Mcf 3.12
Natural Gas Basis Swaps, October 2016 - December 2016  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) | Mcf 920
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) | $ / Mcf (0.38)