Derivative Financial Instruments (Details)	Dec. 31, 2020 USD ($) bbl $ / bbl
Derivative [Line Items]
Derivative Asset (Liability), Net	$ (35,889,000)
Open costless collar contracts
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability)	$ (13,039,000)
Open costless collar contracts \| Oil
Summary of contracts for oil and natural gas
Notional Quantity (Bbl) \| bbl	5,880,000
Weighted Average Price Floor (usd per Bbl) \| $ / bbl	37.19
Weighted Average Price Ceiling (usd per Bbl) \| $ / bbl	48.09
Fair Value of Asset (Liability)	$ (18,734,000)
Open costless collar contracts \| Natural Gas \| 01/01/2021 - 12/31/2021
Summary of contracts for oil and natural gas
Notional Quantity (Bbl) \| bbl	47,000,000
Weighted Average Price Floor (usd per Bbl) \| $ / bbl	2.46
Weighted Average Price Ceiling (usd per Bbl) \| $ / bbl	3.68
Fair Value of Asset (Liability)	$ 5,475,000
Open costless collar contracts \| Natural Gas \| 01/01/2022 - 03/31/2022
Summary of contracts for oil and natural gas
Notional Quantity (Bbl) \| bbl	3,000,000
Weighted Average Price Floor (usd per Bbl) \| $ / bbl	2.60
Weighted Average Price Ceiling (usd per Bbl) \| $ / bbl	4.22
Fair Value of Asset (Liability)	$ 220,000
Open Swap Contracts
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability)	$ (26,451,000)
Open Swap Contracts \| Oil \| 01/01/2021 - 12/31/2021
Summary of contracts for oil and natural gas
Notional Quantity (Bbl) \| bbl	2,040,000
Fixed price (usd per Bbl) \| $ / bbl	35.26
Fair Value of Asset (Liability)	$ (26,451,000)
Open Basis Swap Contracts
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability)	$ 3,601,000
Open Basis Swap Contracts \| Oil Basis Swaps \| 01/01/2021 - 12/31/2021
Summary of contracts for oil and natural gas
Notional Quantity (Bbl) \| bbl	8,400,000
Fixed price (usd per Bbl) \| $ / bbl	0.87
Fair Value of Asset (Liability)	$ 1,229,000
Open Basis Swap Contracts \| Oil Basis Swaps \| 01/01/2022 - 12/31/2022
Summary of contracts for oil and natural gas
Notional Quantity (Bbl) \| bbl	5,520,000
Fixed price (usd per Bbl) \| $ / bbl	0.95
Fair Value of Asset (Liability)	$ 2,372,000

Derivative Asset (Liability), Net

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Open costless collar contracts for oil and natural gas.

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Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958

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The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

+ References

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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 number of units used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

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

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