Oil and Natural Gas Properties - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Proved properties
Oil And Natural Gas Properties [Line Items]
Depletion expenses	$ 24.2	$ 24.5
Unproved properties \| Minimum
Oil And Natural Gas Properties [Line Items]
Unproved oil and gas lease term	3 years
Unproved properties \| Maximum
Oil And Natural Gas Properties [Line Items]
Unproved oil and gas lease term	5 years

The noncash expense charged against earnings to recognize the consumption of oil and gas reserves that are part of an entities' assets.

Reference 1: 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

Name:	us-gaap_DepletionOfOilAndGasProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration