Quarterly report pursuant to Section 13 or 15(d)

Royalty Interests (Details)

v3.21.1
Royalty Interests (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
a
$ / a
Dec. 31, 2020
USD ($)
Net Book Value      
Royalty interests acquired $ 46,266   $ 46,266
Total royalty interests, gross 46,266   46,266
Less: accumulated depletion (831)   (620)
Total royalty interests, net 45,435   $ 45,646
Acquisition of royalty interests $ 0 $ 16,936  
Royalty interest rate 12.50%    
1/16th nonparticipating perpetual royalty interests      
Real Estate Properties [Line Items]      
Nonparticipating perpetual royalty interest rate 6.25%   6.25%
Net Book Value      
1/16th nonparticipating perpetual royalty interest $ 0   $ 0
1/128th nonparticipating perpetual royalty interests      
Real Estate Properties [Line Items]      
Nonparticipating perpetual royalty interest rate 0.78125%   0.78125%
Net Book Value      
1/128th nonparticipating perpetual royalty interest $ 0   $ 0
Additional real estate acquisitions      
Net Book Value      
Net royalty interests (acre) | a   1,017  
Acquisition of royalty interests   $ 16,900  
Average price per net royalty acre acquired (in dollars per acre) | $ / a   16,659