Annual report pursuant to Section 13 and 15(d)

Royalty Interests - Narrative (Details)

v3.20.4
Royalty Interests - Narrative (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
a
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
a
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
a
$ / shares
Dec. 31, 2019
USD ($)
a
$ / shares
Dec. 31, 2018
USD ($)
a
$ / a
$ / shares
Real Estate Properties [Line Items]                      
Acquisition of royalty interests                 $ 16,946 $ 5,017 $ 24,303
Royalty interests sold (in acres) | a                     812
Revenue $ 74,304 $ 74,383 $ 57,273 $ 96,594 $ 113,332 $ 98,530 $ 87,310 $ 191,324 $ 302,554 $ 490,496 $ 300,220
Average price per net royalty acre sold (in USD per acre) | $ / a                     23,234
Additional real estate acquisitions                      
Real Estate Properties [Line Items]                      
Net royalty interests (in acres) | a 1,017       1,247       1,017 1,247 346
Acquisition of royalty interests                     $ 3,700
Average price per net royalty acre acquired (in USD per acre) | $ / a                     10,555
Acquisition in conjunction with sale of 1/8th interest royalty acres                      
Real Estate Properties [Line Items]                      
Net royalty interests (in acres) | a                     1,480
Acquisition of royalty interests                 $ 16,900 $ 4,700 $ 20,600
Average price per net royalty acre acquired (in USD per acre) | $ / shares                 16,668 3,800 13,949
Sale of oil and gas royalty interests                      
Real Estate Properties [Line Items]                      
Revenue                 $ 0 $ 0 $ 18,875