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Investments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Equity securities      
Debt Securities, Available-for-sale [Line Items]      
Cost $ 18,831   $ 18,831
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (3,551)   (1,265)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 11,546   18,080
Available-for-sale Securities 26,826   35,646
Debt Securities, Available-for-sale [Abstract]      
Marketable Securities, Realized Gain (Loss) 0 $ 8  
Equity and debt securities      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities     35,646
Metalla Royalty & Streaming Ltd. | Equity securities      
Debt Securities, Available-for-sale [Line Items]      
Cost 10,463   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 11,546   17,725
Available-for-sale Securities 22,009   28,188
Integra Resources Corp. [Member] | Equity securities      
Debt Securities, Available-for-sale [Line Items]      
Cost 5,000   5,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (1,463)   0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 0   355
Available-for-sale Securities 3,537   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 (1,101)   (376)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 0   0
Available-for-sale Securities 963   1,688
Other Investments [Member] | Equity securities      
Debt Securities, Available-for-sale [Line Items]      
Cost 1,304   1,304
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (987)   (889)
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 0   0
Available-for-sale Securities 317   415
Level 3 | Equity and debt securities      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities     $ 0
Available-for-sale Securities | Level 3 | Equity and debt securities      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities $ 0