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Derivative Instruments - Narrative (Details) $ in Millions			1 Months Ended	2 Months Ended	12 Months Ended
	Mar. 08, 2021 $ / bbl bbl	Nov. 04, 2020 $ / bbl bbl MMBbls	Jun. 30, 2020 USD ($)	Nov. 19, 2020 USD ($)	Dec. 31, 2020 bbl
Crude oil | Three-way Costless Collar Contracts
Derivative [Line Items]
Derivative settlements | $			$ 25.3	$ 37.4
Crude oil | 2021 Fixed Price Swaps | NYMEX WTI
Derivative [Line Items]
Total notional amount of oil barrels (in Bbls)					9,748,000
Crude oil | 2022 Fixed Price Swaps | NYMEX WTI
Derivative [Line Items]
Total notional amount of oil barrels (in Bbls)					7,245,000
Subsequent Event
Derivative [Line Items]
Average floor price (in usd per barrel / dollars per btu) | $ / bbl	45.00
Subsequent Event | Crude oil | 2021 Fixed Price Swaps | NYMEX WTI
Derivative [Line Items]
Total notional amount of oil barrels (in Bbls)	459,000
Subsequent Event | Crude oil | 2022 Fixed Price Swaps | NYMEX WTI
Derivative [Line Items]
Total notional amount of oil barrels (in Bbls)	636,000
Minimum | Minimum Hedge Volume Commitment, Year One
Derivative [Line Items]
Total notional amount of oil barrels (in Bbls) | MMBbls		10,303
Minimum target price (in usd per bbl) | $ / bbl		43.04
Minimum | Minimum Hedge Volume Commitment, Year Two
Derivative [Line Items]
Total notional amount of oil barrels (in Bbls)		6,761
Minimum target price (in usd per bbl) | $ / bbl		43.94
Minimum | Minimum Hedge Volume Commitment, Year Three
Derivative [Line Items]
Total notional amount of oil barrels (in Bbls)		4,945
Minimum target price (in usd per bbl) | $ / bbl		44.79

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- Definition

The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

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- Definition

Floor rate on a price risk derivative such as a floor or a collar. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

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Nominal volume used to calculate payments on a derivative instrument.

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- Definition

The cash inflow provided by derivative instruments during the period, which are classified as investing activities, excluding those designated as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585

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