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Royalty Interests
9 Months Ended
Sep. 30, 2020
Real Estate [Abstract]  
Royalty Interests Royalty Interests
As of September 30, 2020 and December 31, 2019, the Trust owned the following oil and gas royalty interests (in thousands, except number of interests):
Net Book Value
September 30, 2020December 31, 2019
1/16th nonparticipating perpetual royalty interests$— $— 
1/128th nonparticipating perpetual royalty interests — — 
Royalty interests acquired46,265 29,320 
Total royalty interests, gross46,265 29,320 
Less: accumulated depletion(582)(260)
Total royalty interests, net$45,683 $29,060 

No valuation allowance was necessary at September 30, 2020 and December 31, 2019.

For the nine months ended September 30, 2020, the Trust acquired oil and gas royalty interests in approximately 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.

For the nine months ended September 30, 2019, the Trust acquired oil and gas royalty interests in approximately 1,247 net royalty acres (normalized to 1/8th) for an aggregate purchase price of $4.7 million, an average price of approximately $3,800 per net royalty acre.