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Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt Securities, Available-for-sale [Abstract] |  |  |
Gain (Loss) on Investments | $ 2,945 | $ 1,356 | $ (2,691)
Marketable Securities, Realized Gain (Loss) | (7,964) | (1,356) | 2,691
Unrealized gain (loss) on equity securities | (5,019) | 0 | $ 0
Equity securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 14,135 | 21,771 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (1,398) | (881) |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 2,852 | 7,355 |
Available-for-sale Securities | 15,589 | 28,245 |
Debt Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (53) |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 0 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 53 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 2,217 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 2,217 |  |
Equity and debt securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 16,406 | 28,448 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (1,452) | (966) |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 2,852 | 7,355 |
Available-for-sale Securities | 17,806 | 34,837 |
Metalla Royalty & Streaming Ltd. | Equity securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 10,695 | 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 | 2,852 | 1,354 |
Available-for-sale Securities | 13,547 | 7,648 |
Metalla Royalty & Streaming Ltd. | Debt Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 2,271 | 6,677 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (54) | (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 |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
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 |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
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. | Equity securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
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 |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 2,064 | 2,064 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (452) | (193) |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0 |
Available-for-sale Securities | 1,612 | 1,871 |
Other Investments [Member] | Equity securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 1,376 | 1,479 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (946) | (453) |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 405 |
Available-for-sale Securities | 430 | 1,431 |
Kootenay Silver, Inc. [Member] | Equity securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
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 |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities |  | $ 6,891 |
Available-for-sale Securities | Level 3 | Equity and debt securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities | $ 2,217 |  |

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