Oil and Natural Gas Interests (Details Textual) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
Feb. 28, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Oil And Gas Exploration And Production Industries Disclosures [Abstract]
Unaffiliated third party for cash proceeds amount	$ 121.1
Realized gain on sale of oil and gas properties	$ 41.4	$ 0.0	$ 0.0	$ 41.4

The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585

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