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Other Investments - Summary (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Other Investments |  |
Proceeds from Sale and Maturity of Marketable Securities | $ 413 | $ 170
Fair value at beginning of period | 5,462 | 3,746
Unrealized gain/(loss) | (1,643) | 1,716
Fair value at end of period | $ 3,676 | $ 5,462
Midas Gold Shares [Member] |  |
Other Investments |  |
Shares owned | 6,882,115 | 7,802,615
Marketable Securities Cumulative Gain (Loss) | $ 1,975 | $ 1,973
Number Marketable Securities Sold | 920,500 |
Proceeds from Sale and Maturity of Marketable Securities | $ 413 |
Marketable Securities, Realized Gain (Loss) | (2) |
Realized change | (415) |
Unrealized gain/(loss) | $ 230 |
Nusantara Resources |  |
Other Investments |  |
Shares owned | 1,333,334 |
Realized change | $ 272 |
Midas Gold And Nusantara Resources [Member] |  |
Other Investments |  |
Unrealized gain/(loss) | $ 1,413 |

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