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Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Debt Securities, Available-for-sale [Abstract] |  |  |
Gain (Loss) on Sale of Equity Investments | $ 16,208 | $ 2,945 | $ 1,356
Marketable Securities, Realized Gain (Loss) | (860) | (7,964) | (1,356)
Unrealized gain (loss) on equity securities | 15,348 | (5,019) | 0
Investment in Marketable Securities (Textual) [Abstract] |  |  |
Debt Securities, Held-to-maturity, Restricted | 8,800 | 12,300 |
Equity securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 18,831 | 14,135 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (1,264) | (1,398) |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 18,080 | 2,852 |
Available-for-sale Securities | 35,646 | 15,589 |
Debt Securities, Available-for-sale [Abstract] |  |  |
Marketable Securities, Realized Gain (Loss) | (860) | (7,964) | $ 0
Equity and debt securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost |  | 16,406 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | (1,452) |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  | 2,852 |
Available-for-sale Securities |  | 17,806 |
Metalla Royalty & Streaming Ltd. | Equity securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 10,463 | 10,695 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0 |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 17,725 | 2,852 |
Available-for-sale Securities | 28,188 | 13,547 |
Metalla Royalty & Streaming Ltd. | Debt Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost |  | 2,271 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | (54) |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0 |
Available-for-sale Securities |  | 2,217 |
Integra Resources Corp. [Member] | Equity securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 5,000 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 355 |  |
Available-for-sale Securities | 5,355 |  |
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 | (376) | (452) |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0 |
Available-for-sale Securities | 1,688 | 1,612 |
Other Investments [Member] | Equity securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 1,304 | 1,376 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (888) | (946) |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0 |
Available-for-sale Securities | 415 | 430 |
Level 3 | Equity and debt securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities |  | $ 2,217 |
Available-for-sale Securities | Level 3 | Equity and debt securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities | $ 0 |  |

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