REVENUE - Metal Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue
Revenue	$ 146,441	$ 168,027	$ 308,796	$ 310,616
Stream interests
Disaggregation of Revenue
Revenue	104,879	114,421	210,130	209,767
Stream interests | Gold
Disaggregation of Revenue
Revenue	75,325	91,187	152,827	156,698
Stream interests | Silver
Disaggregation of Revenue
Revenue	12,892	8,449	24,331	21,255
Stream interests | Copper
Disaggregation of Revenue
Revenue	16,662	14,785	32,972	31,814
Royalty interests
Disaggregation of Revenue
Revenue	41,562	53,606	98,666	100,849
Royalty interests | Gold
Disaggregation of Revenue
Revenue	28,974	37,164	66,890	68,409
Royalty interests | Silver
Disaggregation of Revenue
Revenue	3,512	4,356	7,829	8,564
Royalty interests | Copper
Disaggregation of Revenue
Revenue	3,281	3,977	9,986	7,993
Royalty interests | Other
Disaggregation of Revenue
Revenue	$ 5,795	$ 8,109	$ 13,961	$ 15,883