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Short-term and Other Investments - Other Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Other Investments |  |  |  |  |
Proceeds from Sale and Maturity of Marketable Securities |  |  | $ 5,788 |  |
Other investments, at fair value | $ 295 |  | $ 295 |  | $ 3,676
Midas Gold Shares [Member] |  |  |  |  |
Other Investments |  |  |  |  |
Shares owned | 0 |  | 0 |  | 6,882,115
Marketable Securities Cumulative Gain (Loss) | $ (11,841) |  | $ (11,841) |  | $ (14,415)
Number Marketable Securities Sold | 4,667,615 | 0 | 6,882,115 | 0 |
Proceeds from Sale and Maturity of Marketable Securities | $ 4,835 |  | $ 5,788 |  |
Marketable Securities, Realized Gain (Loss) | $ 2,454 |  | $ 2,574 |  |
Nusantara Resources |  |  |  |  |
Other Investments |  |  |  |  |
Shares owned | 1,333,334 |  | 1,333,334 |  | 1,333,334

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