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Investment in Associates - Activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of associates [line items]    
Balance of investment in Maverix, December 31, $ 55,017  
Income (loss) in associate 13,679 $ 2,052
Balance of investment in Maverix, December 31, 70,566 55,017
Maverix Metals Inc. [member]    
Disclosure of associates [line items]    
Balance of investment in Maverix, December 31, 53,567 48,284
Investment in associate 0 2,473
Dilution gain 13,288 2,273
Adjustment for change in ownership interest 1,870 758
Income (loss) in associate 391 (221)
Balance of investment in Maverix, December 31, 69,116 53,567
Other [member]    
Disclosure of associates [line items]    
Balance of investment in Maverix, December 31, 1,450  
Balance of investment in Maverix, December 31, $ 1,450 $ 1,450