Quarterly report pursuant to Section 13 or 15(d)

Royalty Interests

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Royalty Interests
 9 Months Ended
Sep. 30, 2021
Real Estate [Abstract]  
Royalty Interests Royalty Interests
As of September 30, 2021 and December 31, 2020, we owned the following oil and gas royalty interests (in thousands):
Net Book Value
September 30, 2021 December 31, 2020
1/16th nonparticipating perpetual royalty interests $ —  $ — 
1/128th nonparticipating perpetual royalty interests —  — 
Royalty interests acquired 46,266  46,266 
Total royalty interests, gross 46,266  46,266 
Less: accumulated depletion (1,115) (620)
Total royalty interests, net $ 45,151  $ 45,646 

There were no oil and gas royalty interest transactions for the nine months ended September 30, 2021. For the nine months ended September 30, 2020, we acquired oil and gas royalty interests in 1,017 net royalty acres (normalized to 1/8th) for an aggregate purchase price of $16.9 million, an average price of approximately $16,668 per net royalty acre.