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Investments (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities | $ 8,209 |  |
Equity securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 7,502 |  | $ 7,668
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  | (1)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 707 |  | 5,276
Available-for-sale Securities | 8,209 |  | 12,943
Debt Securities, Available-for-sale [Abstract] |  |  |
Marketable Securities, Realized Gain (Loss) | (769) | $ 0 |
Equity and debt securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities |  |  | 12,943
Metalla Royalty & Streaming Ltd. |  |  |
Investment in Marketable Securities (Textual) [Abstract] |  |  |
Proceeds from sale of equity method investments | 900 |  |
Equity method investment, realized gain on disposal | $ 800 |  |
Equity method investment, amount sold (in shares) | 83,556 |  |
Metalla Royalty & Streaming Ltd. | Equity securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | $ 7,500 |  | 166
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 707 |  | 875
Available-for-sale Securities | 8,207 |  | 1,041
Integra Resources Corp. [Member] | Equity securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost |  |  | 7,500
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  |  | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  |  | 4,401
Available-for-sale Securities |  |  | 11,901
Other Investments [Member] | Equity securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 2 |  | 2
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  | (1)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0
Available-for-sale Securities | 2 |  | 1
Level 3 | Equity securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities | $ 0 |  |
Level 3 | Equity and debt securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities |  |  | $ 0

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