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Other Investments - Summary (Details) - USD ($)
$ in Thousands
 12 Months Ended
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