REVENUE - Metal Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue
Total revenue	$ 252,068	$ 193,837	$ 655,148	$ 516,835
Stream revenue:
Disaggregation of Revenue
Total revenue	166,081	133,052	421,754	358,531
Royalty revenue:
Disaggregation of Revenue
Total revenue	85,987	60,785	233,394	158,304
Gold | Stream revenue:
Disaggregation of Revenue
Total revenue	131,950	100,126	330,965	270,000
Gold | Royalty revenue:
Disaggregation of Revenue
Total revenue	64,655	46,837	175,681	117,504
Silver | Stream revenue:
Disaggregation of Revenue
Total revenue	22,533	20,026	60,279	51,653
Silver | Royalty revenue:
Disaggregation of Revenue
Total revenue	7,767	3,674	17,684	12,981
Copper | Stream revenue:
Disaggregation of Revenue
Total revenue	11,598	12,900	30,510	36,878
Copper | Royalty revenue:
Disaggregation of Revenue
Total revenue	4,794	4,808	17,459	12,077
Other | Royalty revenue:
Disaggregation of Revenue
Total revenue	$ 8,771	$ 5,466	$ 22,570	$ 15,742