Derivatives - Open Commodity Derivative Contracts (Details) - Natural Gas Price Swaps, January 2019 - March 2019	12 Months Ended
Dec. 31, 2018 $ / Mcf MMcf
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional (MMcf) \| MMcf	4,500
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) \| $ / Mcf	4.28

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