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Investments (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Investment in Marketable Securities (Textual) [Abstract] |  |  |  |
Impairment of equity securities | $ 703 | $ 426 | $ 700 | $ 2,346
Held-to-maturity Securities, Restricted |  | 20,800 | 17,600 |
Equity securities |  |  |  |
Available-for-sale Securities |  |  |  |
Cost |  | 21,771 | 3,107 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | (881) | 0 |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  | 7,355 | 1,381 |
Available-for-sale Securities |  | 28,245 | 4,488 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 881 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 5,662 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 0 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 5,662 |  |
Debt Securities |  |  |  |
Available-for-sale Securities |  |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | (85) |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 85 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 6,592 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 0 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 6,592 |  |
Equity and debt securities |  |  |  |
Available-for-sale Securities |  |  |  |
Cost |  | 28,448 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | (966) |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  | 7,355 |  |
Available-for-sale Securities |  | 34,837 |  |
Metalla Royalty & Streaming Ltd. | Equity securities |  |  |  |
Available-for-sale Securities |  |  |  |
Cost |  | 6,294 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0 |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  | 1,354 |  |
Available-for-sale Securities |  | 7,648 |  |
Metalla Royalty & Streaming Ltd. | Debt Securities |  |  |  |
Available-for-sale Securities |  |  |  |
Cost |  | 6,677 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | (85) |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0 |  |
Available-for-sale Securities |  | 6,592 |  |
Corvus Gold Inc. [Member] | Equity securities |  |  |  |
Available-for-sale Securities |  |  |  |
Cost |  | 3,582 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0 |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  | 4,518 |  |
Available-for-sale Securities |  | 8,100 |  |
Almaden Minerals, Ltd. [Member] | Equity securities |  |  |  |
Available-for-sale Securities |  |  |  |
Cost |  | 3,125 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | (235) |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0 |  |
Available-for-sale Securities |  | 2,890 |  |
Northern Empire Resources Corp. [Member] | Equity securities |  |  |  |
Available-for-sale Securities |  |  |  |
Cost |  | 4,489 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0 |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  | 1,077 |  |
Available-for-sale Securities |  | 5,566 |  |
Rockhaven Resources, Ltd. [Member] | Equity securities |  |  |  |
Available-for-sale Securities |  |  |  |
Cost |  | 2,064 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | (193) |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0 |  |
Available-for-sale Securities |  | 1,871 |  |
Kootenay Silver, Inc. [Member] | Equity securities |  |  |  |
Available-for-sale Securities |  |  |  |
Cost |  | 738 | 2,645 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0 | 0 |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  | 1 | 0 |
Available-for-sale Securities |  | 739 | 2,645 |
Silver Bull Resources, Inc. [Member] | Equity securities |  |  |  |
Available-for-sale Securities |  |  |  |
Cost |  |  | 233 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  |  | 0 |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  |  | 783 |
Available-for-sale Securities |  |  | 1,016 |
Other Investments [Member] | Equity securities |  |  |  |
Available-for-sale Securities |  |  |  |
Cost |  | 1,479 | 229 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | (453) | 0 |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  | 405 | 598 |
Available-for-sale Securities |  | $ 1,431 | $ 827 |

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