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REVENUE - Metal Disaggregation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Disaggregation of Revenue        
Revenue $ 131,429 $ 174,431 $ 440,226 $ 485,047
Stream interests        
Disaggregation of Revenue        
Revenue 98,732 115,921 308,863 325,688
Stream interests | Gold        
Disaggregation of Revenue        
Revenue 76,833 83,318 229,661 240,016
Stream interests | Silver        
Disaggregation of Revenue        
Revenue 12,063 13,877 36,393 35,132
Stream interests | Copper        
Disaggregation of Revenue        
Revenue 9,836 18,726 42,809 50,540
Royalty interests        
Disaggregation of Revenue        
Revenue 32,697 58,510 131,363 159,359
Royalty interests | Gold        
Disaggregation of Revenue        
Revenue 23,163 43,417 90,054 111,826
Royalty interests | Silver        
Disaggregation of Revenue        
Revenue 2,648 3,952 10,477 12,517
Royalty interests | Copper        
Disaggregation of Revenue        
Revenue 1,285 4,967 11,271 12,960
Royalty interests | Other        
Disaggregation of Revenue        
Revenue $ 5,601 $ 6,174 $ 19,561 $ 22,056