REVENUE - Property Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue
Revenue	$ 170,392	$ 162,355
Stream interests
Disaggregation of Revenue
Revenue	114,990	105,251
Stream interests | Mt. Milligan
Disaggregation of Revenue
Revenue	46,656	42,416
Stream interests | Pueblo Viejo
Disaggregation of Revenue
Revenue	22,358	23,264
Stream interests | Andacollo
Disaggregation of Revenue
Revenue	12,934	15,674
Stream interests | Khoemacau
Disaggregation of Revenue
Revenue	9,153	2,389
Stream interests | Other interest
Disaggregation of Revenue
Revenue	23,889	21,508
Royalty interests
Disaggregation of Revenue
Revenue	55,402	57,104
Royalty interests | Cortez Legacy Zone
Disaggregation of Revenue
Revenue	23,087	16,714
Royalty interests | Cortez CC Zone
Disaggregation of Revenue
Revenue	3,206
Royalty interests | Penasquito
Disaggregation of Revenue
Revenue	7,433	13,094
Royalty interests | Other interest
Disaggregation of Revenue
Revenue	$ 21,676	$ 27,296