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Investments (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Available-for-sale Securities [Abstract] |  |  |
Gain (Loss) on Investments | $ 4,529 | $ (1,471) |
Marketable Securities, Realized Gain (Loss) | 313 | 1,471 |
Marketable Securities, Unrealized Gain (Loss) | 4,842 | $ 0 |
Investment in Marketable Securities (Textual) [Abstract] |  |  |
Held-to-maturity Securities, Restricted | 22,100 |  | $ 17,600
Equity securities |  |  |
Available-for-sale Securities |  |  |
Cost | 19,686 |  | 21,771
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (1,478) |  | (881)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 12,795 |  | 7,355
Available-for-sale Securities | 31,003 |  | 28,245
Debt Securities |  |  |
Available-for-sale Securities |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  |  | (363)
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 |  |  | 363
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  |  | 6,314
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 |  |  | 6,314
Equity and debt securities |  |  |
Available-for-sale Securities |  |  |
Cost | 26,363 |  | 28,448
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (1,841) |  | (966)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 12,795 |  | 7,355
Available-for-sale Securities | 37,317 |  | 34,837
Metalla Royalty & Streaming Ltd. | Equity securities |  |  |
Available-for-sale Securities |  |  |
Cost | 6,294 |  | 6,294
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 2,837 |  | 1,354
Available-for-sale Securities | 9,131 |  | 7,648
Metalla Royalty & Streaming Ltd. | Debt Securities |  |  |
Available-for-sale Securities |  |  |
Cost | 6,677 |  | 6,677
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (363) |  | (85)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0
Available-for-sale Securities |  |  | 6,592
Corvus Gold Inc. [Member] | Equity securities |  |  |
Available-for-sale Securities |  |  |
Cost | 3,582 |  | 3,582
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 6,844 |  | 4,518
Available-for-sale Securities | 10,426 |  | 8,100
Almaden Minerals, Ltd. [Member] | Equity securities |  |  |
Available-for-sale Securities |  |  |
Cost | 2,067 |  | 3,125
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (727) |  | (235)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0
Available-for-sale Securities | 1,340 |  | 2,890
Northern Empire Resources Corp. [Member] | Equity securities |  |  |
Available-for-sale Securities |  |  |
Cost | 4,489 |  | 4,489
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 2,999 |  | 1,077
Available-for-sale Securities | 7,488 |  | 5,566
Rockhaven Resources, Ltd. [Member] | Equity securities |  |  |
Available-for-sale Securities |  |  |
Cost | 2,064 |  | 2,064
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (596) |  | (193)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0
Available-for-sale Securities | 1,468 |  | 1,871
Other Investments [Member] | Equity securities |  |  |
Available-for-sale Securities |  |  |
Cost | 1,190 |  | 1,479
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (155) |  | (453)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 115 |  | 405
Available-for-sale Securities | 1,150 |  | 1,431
Kootenay Silver, Inc. [Member] | Equity securities |  |  |
Available-for-sale Securities |  |  |
Cost |  |  | 738
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  |  | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  |  | 1
Available-for-sale Securities |  |  | 739
Level 3 | Equity and debt securities |  |  |
Available-for-sale Securities |  |  |
Available-for-sale Securities |  |  | $ 6,891
Available-for-sale Securities | Level 3 | Equity and debt securities |  |  |
Available-for-sale Securities |  |  |
Available-for-sale Securities | $ 6,314 |  |

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