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Investment in Associates - Activity (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
May 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Disclosure of associates [line items]      
Balance of investment in Maverix, December 31,   $ 70,566  
Income (loss) in associate   15,245 $ 13,679
Balance of investment in Maverix, December 31,   84,319 70,566
Gain on sale of interest in equity investee   3,858 7,973
Maverix Metals Inc. [member]      
Disclosure of associates [line items]      
Balance of investment in Maverix, December 31,   69,116 53,567
Dilution gains   13,438 15,158
Income (loss) in associate   1,765 391
Balance of investment in Maverix, December 31,   84,319 69,116
Other [member]      
Disclosure of associates [line items]      
Balance of investment in Maverix, December 31,   1,450  
Balance of investment in Maverix, December 31,   $ 0 $ 1,450
Sale of interest in equity investee $ 5,000    
Gain on sale of interest in equity investee $ 3,600