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 | |