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Derivatives - Schedule of Derivative Instruments (Details) - Scenario, Forecast MMBTU in Thousands, MBbls in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2020 MMBTU $ / bbl $ / MMBtu MBbls	Sep. 30, 2020 MMBTU $ / bbl $ / MMBtu MBbls	Jun. 30, 2020 MMBTU $ / bbl $ / MMBtu MBbls	Mar. 31, 2020 MMBTU $ / bbl $ / MMBtu MBbls	Dec. 31, 2021 MMBTU $ / bbl $ / MMBtu MBbls
Fixed Price Oil Swaps (Brent)
Derivative [Line Items]
Hedged volume (MBbls) | MBbls	1,472	1,472	1,456	1,729	730
Weighted-average price ($/Bbl) | $ / bbl	64.21	64.21	64.30	63.92	58.50
Fixed Price Oil Swaps (WTI)
Derivative [Line Items]
Hedged volume (MBbls) | MBbls	0	0	30	91	0
Weighted-average price ($/Bbl) | $ / bbl	0.00	0.00	61.75	61.75	0.00
Fixed Price Gas Purchase Swaps (Kern, Delivered)
Derivative [Line Items]
Hedged volume (MMBtu) | MMBTU	2,315	5,060	5,005	5,005	900
Weighted-average price ($/MMBtu) | $ / MMBtu	2.79	2.89	2.89	2.89	2.50
Fixed Price Gas Purchase Swaps (SoCal Citygate)
Derivative [Line Items]
Hedged volume (MMBtu) | MMBTU	155	460	455	455	0
Weighted-average price ($/MMBtu) | $ / MMBtu	3.80	3.80	3.80	3.80	0.00

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Average fixed price related to the group of price risk swap derivatives.

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