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