Basis of Presentation (Details Textuals 2) $ in Thousands	3 Months Ended
Mar. 31, 2021 USD ($) $ / Barrel	Mar. 31, 2020 USD ($)
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items]
Impairment of unevaluated costs		$ 244,900
Write-down of oil and natural gas properties	$ 14,377	$ 72,541
Oil
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items]
Average price \| $ / Barrel	36.40

The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 360
-Section 35
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=66906256&loc=d3e66150-109466

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration