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Annual report pursuant to Section 13 and 15(d)

Organization and Description of Business Segments (Details)

v3.20.4
Organization and Description of Business Segments (Details)
a in Thousands
12 Months Ended
Dec. 31, 2020
a
segment
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Number of operating segments | segment 2
1/16th nonparticipating perpetual royalty interest
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Nonparticipating perpetual royalty interest rate (in percentage) 6.25% 6.25%
1/128th nonparticipating perpetual royalty interest
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Nonparticipating perpetual royalty interest rate (in percentage) 0.78125% 0.78125%
West Texas
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Area of land (in acres) 880
West Texas | 1/128th Nonparticipating perpetual oil and gas royalty interest
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Area of land (in acres) 85
West Texas | 1/16th Nonparticipating perpetual oil and gas royalty interest
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Area of land (in acres) 371
West Texas | 1/8th Net royalty acres
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Area of land (in acres) 4