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Investments (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 28, 2022 | Mar. 21, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Debt Securities, Available-for-sale [Abstract] |  |  |  |  |  |  |  |
Marketable Securities, Realized Gain (Loss) |  |  | $ 0 |  | $ 0 | $ 0 | $ (769) |
Unrealized gain (loss) on equity securities |  |  | (62,810) |  | $ 36,575 | (49,066) | $ 32,007 |
Equity securities |  |  |  |  |  |  |  |
Investment in Marketable Securities (Textual) [Abstract] |  |  |  |  |  |  |  |
Cost |  |  | 154,118 |  |  | 154,118 |  | $ 138,165
Equity Securities, FV-NI, Unrealized Gain (Loss) |  |  |  | $ 0 |  | 0 |  |
Equity Securities, FV-NI, Unrealized Gain |  |  |  | 5,968 |  | 55,034 |  |
Current liabilities |  |  | 99,084 |  |  | 99,084 |  | 132,197
Victoria Gold Corp | Equity securities |  |  |  |  |  |  |  |
Investment in Marketable Securities (Textual) [Abstract] |  |  |  |  |  |  |  |
Cost |  |  | 128,710 |  |  | 128,710 |  | 128,710
Equity Securities, FV-NI, Unrealized Gain (Loss) |  |  |  | 0 |  | 0 |  |
Equity Securities, FV-NI, Unrealized Gain |  |  |  | 4,499 |  | 41,171 |  |
Current liabilities |  |  | 87,539 |  |  | 87,539 |  | 124,211
Proceeds from sale of equity method investments | $ 40,500 |  |  |  |  |  |  |
Equity method investment, amount sold (in shares) | 5,000,000 |  |  |  |  |  |  |
Equity Method Investments, Sale of Stock, Price Per Share | $ 8.34 |  |  |  |  |  |  |
Integra Resources Corp. [Member] | Equity securities |  |  |  |  |  |  |  |
Investment in Marketable Securities (Textual) [Abstract] |  |  |  |  |  |  |  |
Cost |  |  | 9,455 |  |  | 9,455 |  | 9,455
Equity Securities, FV-NI, Unrealized Gain (Loss) |  |  |  | 0 |  | 0 |  |
Equity Securities, FV-NI, Unrealized Gain |  |  |  | $ 1,469 |  | 5,691 |  |
Current liabilities |  |  | 3,764 |  |  | 3,764 |  | $ 7,986
Avino Silver & Gold Mines Ltd | Equity securities |  |  |  |  |  |  |  |
Investment in Marketable Securities (Textual) [Abstract] |  |  |  |  |  |  |  |
Shares purchased during period, shares |  | 14,000,000 |  |  |  |  |  |
Investment owned, percent of assets |  | 12.00% |  |  |  |  |  |
Cost |  |  | 13,720 |  |  | 13,720 |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) |  |  |  |  |  | 0 |  |
Equity Securities, FV-NI, Unrealized Gain |  |  |  |  |  | 6,145 |  |
Current liabilities |  |  | 7,575 |  |  | 7,575 |  |
Other Investments [Member] | Equity securities |  |  |  |  |  |  |  |
Investment in Marketable Securities (Textual) [Abstract] |  |  |  |  |  |  |  |
Cost |  |  | 2,233 |  |  | 2,233 |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) |  |  |  |  |  | 0 |  |
Equity Securities, FV-NI, Unrealized Gain |  |  |  |  |  | 2,027 |  |
Current liabilities |  |  | $ 206 |  |  | $ 206 |  |

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