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Short-term and Other Investments - Other Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Other Investments |  |  |  |  |
Proceeds from Sale and Maturity of Marketable Securities |  |  | $ 954 |  |
Other investments, at fair value | $ 2,692 |  | $ 2,692 |  | $ 3,676
Midas Gold Shares [Member] |  |  |  |  |
Other Investments |  |  |  |  |
Shares owned | 4,667,615 |  | 4,667,615 |  | 6,882,115
Marketable Securities Cumulative Gain (Loss) | $ (4,730) |  | $ (4,730) |  | $ (4,850)
Number Marketable Securities Sold | 1,572,500 | 0 | 2,214,500 | 0 |
Proceeds from Sale and Maturity of Marketable Securities | $ 654 |  | $ 954 |  |
Marketable Securities, Realized Gain (Loss) | $ 135 |  | $ 120 |  |
Nusantara Resources |  |  |  |  |
Other Investments |  |  |  |  |
Shares owned | 1,333,334 |  | 1,333,334 |  | 1,333,334

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