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Derivatives - Open Commodity Derivative Contracts (Details)
 9 Months Ended
Sep. 30, 2018
$ / bbl
$ / Mcf
MBbls
MMcf
Oil Price Swaps, October 2018 - December 2018  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) | MBbls 828
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) | $ / bbl 56.12
Oil Price Swaps, January 2019 - December 2019  
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 54.29
Natural Gas Price Swaps, October 2018 - December 2018  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) | MMcf 3,680
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) | $ / Mcf 3.11