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Derivatives - Open Commodity Derivative Contracts (Details)
 6 Months Ended
Jun. 30, 2018
$ / bbl
MBbls
MMcf
July 2018 - December 2018  
Derivative Instruments And Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) | MBbls 1,748
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 56.08
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) 54.29
July 2018 - December 2018  
Derivative Instruments And Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) | MMcf 7,360
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 3.11