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Derivatives - Open Commodity Derivative Contracts (Details)
 6 Months Ended
Jun. 30, 2017
$ / Mcf
$ / bbl
MBbls
MMcf
Oil Price Swaps, July 2017- December 2017  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) | MBbls 1,656
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) | $ / bbl 52.24
Oil Price Swaps, January 2018 - December 2018  
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 55.34
Natural Gas Price Swaps, July 2017 - December 2017  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) | MMcf 16,560
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) | $ / Mcf 3.20
Natural Gas Price Swaps, January 2018 - December 2018  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) | MMcf 16,400
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) | $ / Mcf 3.15