Commitments and Contingencies - Contract Liability (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Business Acquisition [Line Items]
Revenue Recognized	$ 55,159	$ 10,115
Franco-Nevada
Business Acquisition [Line Items]
Opening Balance	6,943	7,411
Revenue Recognized	(159)	(115)
Closing Balance	6,784	7,296
Kensington
Business Acquisition [Line Items]
Opening Balance	55,082	25,016
Additions	55,030	111
Revenue Recognized	(55,000)	(10,000)
Closing Balance	55,112	$ 15,127
Kensington \| December 2023 Prepayment
Business Acquisition [Line Items]
Closing Balance	25,000
Wharf \| December 2023 Prepayment
Business Acquisition [Line Items]
Closing Balance	12,500
Rochester \| December 2023 Prepayment
Business Acquisition [Line Items]
Closing Balance	$ 17,500

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
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-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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