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Royalty Interests (Tables)
 9 Months Ended
Sep. 30, 2019
Real Estate [Abstract]  
Schedule of Royalty Interests
As of September 30, 2019 and December 31, 2018, the Trust owned the following oil and gas royalty interests (in thousands, except number of interests):
Net Book Value
September 30, 2019December 31, 2018
1/16th nonparticipating perpetual royalty interests$—  $—  
1/128th nonparticipating perpetual royalty interests —  —  
Royalty interests acquired29,320  24,303  
Total royalty interests$29,320  $24,303