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COMMITMENTS AND CONTINGENCIES - Prepayment agreement (Details) - Auramet International LLC ("Auramet") - Prepayment Agreement - Guarantee Obligation - Precious metal - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Other Commitments
Net proceeds from sales on a Supplier Advance Basis	$ 26,300,000	$ 0	$ 64,600,000	$ 4,800,000
Revenue from sales on a Supplier Advance Basis	17,000,000	$ 0	55,300,000	$ 4,800,000
Remaining net proceeds recorded as deferred revenue	$ 9,300,000		$ 9,300,000
Number of ounces of gold	2,500		2,500

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(20))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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