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Investments (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Sep. 14, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available-for-sale Securities |  | $ 12,943 |  |
Equity securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Cost |  | 7,668 | $ 18,831 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | (1) | (1,265) |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  | 5,276 | 18,080 |
Available-for-sale Securities |  | 12,943 | 35,646 |
Debt Securities, Available-for-sale [Abstract] |  |  |  |
Marketable Securities, Realized Gain (Loss) |  | (19,140) | (860) | $ (7,964)
Equity and debt securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available-for-sale Securities |  |  | 35,646 |
Metalla Royalty & Streaming Ltd. |  |  |  |
Investment in Marketable Securities (Textual) [Abstract] |  |  |  |
Proceeds from sale of equity method investments |  | 20,700 |  |
Equity method investment, realized gain on disposal |  | 11,600 |  |
Investment income, investment expense |  | $ 1,300 |  |
Equity method investment, amount sold (in shares) |  | 3,910,000 |  |
Par value, common stock (in dollars per share) |  | $ 5.30 |  |
Royalty interest, percent |  | 0.3875% |  |
Payments to acquire royalty interests in mining properties (in shares) |  | 421,554 |  |
Equity method investment, realized gain on disposal |  | $ 1,400 |  |
Metalla Royalty & Streaming Ltd. | Equity securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Cost |  | 166 | 10,463 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0 | 0 |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  | 875 | 17,725 |
Available-for-sale Securities |  | 1,041 | 28,188 |
Integra Resources Corp. [Member] |  |  |  |
Investment in Marketable Securities (Textual) [Abstract] |  |  |  |
Proceeds from sale of equity method investments | $ 2,500 |  |  |
Equity method investment, amount sold (in shares) | 735,294 |  |  |
Par value, common stock (in dollars per share) | $ 3.40 |  |  |
Equity Method Investment, Ownership Percentage | 5.60% |  |  |
Integra Resources Corp. [Member] | Equity securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Cost |  | 7,500 | 5,000 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0 | 0 |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  | 4,401 | 355 |
Available-for-sale Securities |  | 11,901 | 5,355 |
Rockhaven Resources, Ltd. [Member] |  |  |  |
Investment in Marketable Securities (Textual) [Abstract] |  |  |  |
Proceeds from sale of equity method investments |  | 1,300 |  |
Equity method investment, realized gain on disposal |  | $ 800 |  |
Equity method investment, amount sold (in shares) |  | 15,150,000 |  |
Par value, common stock (in dollars per share) |  | $ 0.08 |  |
Rockhaven Resources, Ltd. [Member] | Equity securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Cost |  |  | 2,064 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  |  | (376) |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  |  | 0 |
Available-for-sale Securities |  |  | 1,688 |
Other Investments [Member] | Equity securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Cost |  | $ 2 | 1,304 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | (1) | (889) |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0 | 0 |
Available-for-sale Securities |  | 1 | 415 |
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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