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Investment in Associates - Activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of associates [line items]    
Income (loss) in associate $ 10,529 $ 15,245
Maverix Metals Inc. [member]    
Disclosure of associates [line items]    
Balance of investment, beginning of period 84,319 69,116
Disposal of investment in associate (23,467) 0
Adjustment for change in ownership interest 1,489 (42)
Dividends (1,310) 0
Dilution gains 9,160 13,480
Income (loss) in associate 1,369 1,765
Balance of investment, end of period $ 71,560 $ 84,319