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Other Investments - Summary (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Other Investments |  |
Proceeds from Sale and Maturity of Marketable Securities | $ 5,788 | $ 413
Fair value at beginning of period | 3,676 | 5,462
Unrealized gain/(loss) | 2,405 | (1,643)
Fair value at end of period | 293 | $ 3,676
Midas Gold Shares [Member] |  |
Other Investments |  |
Shares owned |  | 6,882,115
Marketable Securities Cumulative Gain (Loss) | (11,841) | $ (1,975)
Marketable Securities Cumulative Gain (Loss), Recognized As Unrealized In Previous Periods | (14,415) | $ (1,973)
Number Marketable Securities Sold |  | 920,500
Proceeds from Sale and Maturity of Marketable Securities | 5,788 | $ 413
Marketable Securities, Realized Gain (Loss) | 2,574 | (2)
Realized change | $ (5,788) | $ (415)
Nusantara Resources |  |
Other Investments |  |
Shares owned | 1,333,334 | 1,333,334
Realized change | $ 0 | $ 272

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