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Investment in Associates - Activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of associates [line items]    
Balance of investment in Maverix, December 31, $ 49,734  
Loss in associate 2,052 $ 7,946
Balance of investment in Maverix, December 31, 55,017 49,734
Maverix Metals Inc. [member]    
Disclosure of associates [line items]    
Balance of investment in Maverix, December 31, 48,284 29,371
Investment in associate 2,473 0
Dilution gain 2,273 10,979
Adjustment for change in ownership interest 758 10,967
Loss in associate (221) (3,033)
Balance of investment in Maverix, December 31, 53,567 48,284
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