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Derivatives - Derivative Transactions Resulting in Hedged Gas Contracts Outstanding (Details) - Scenario, Forecast MMBTU in Thousands	3 Months Ended
	Dec. 31, 2019 MMBTU $ / bbl $ / MMBtu MBbls	Sep. 30, 2019 MMBTU $ / bbl $ / MMBtu MBbls	Jun. 30, 2019 MMBTU $ / bbl $ / MMBtu MBbls
Derivative [Line Items]
Volume of hedged crude oil production (MBbl) | MBbls	12,000	12,000	19,000
Hedged Crude Oil Production
Derivative [Line Items]
Price per barrel of hedged crude oil (in dollars per barrel) | $ / bbl	65.33	65.33	65.99
Oil Calls Options (Brent)
Derivative [Line Items]
Hedged volume (MBbls) | MBbls	92,000	92,000	180,000
Weighted-average price ($/Bbl) | $ / bbl	81.00	81.00	70.00
Oil Put Options (Brent)
Derivative [Line Items]
Hedged volume (MBbls) | MBbls	460,000	460,000	1,092,000
Weighted-average price ($/Bbl) | $ / bbl	50.00	50.00	60.00
Fixed Price Oil Swaps (Brent)
Derivative [Line Items]
Hedged volume (MBbls) | MBbls	644,000	644,000	637,000
Weighted-average price ($/Bbl) | $ / bbl	76.27	76.27	76.27
Brent-WTI Oil Basis Swaps
Derivative [Line Items]
Hedged volume (MBbls) | MBbls	46,000	46,000	46,000
Weighted-average price ($/Bbl) | $ / bbl	1.29	1.29	1.29
Fixed Price Gas Purchase Swaps (Kern, Delivered)
Derivative [Line Items]
Weighted-average price ($/Bbl) | $ / MMBtu	2.65	2.65	2.70
Hedged volume (MMBtu) | MMBTU	465	1,380	2,730

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- Definition

Nominal volume used to calculate payments on a derivative instrument.

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

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- Definition

Average variable price rate related to the group of price risk swap derivatives.

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- Definition

The quantity of future oil and gas production being hedged.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 360
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 12.D.3(b))
-URI http://asc.fasb.org/extlink&oid=27015634&loc=d3e516453-122869

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