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Exploration and Evaluation Assets (Tables)
 12 Months Ended
Dec. 31, 2019
Exploration For And Evaluation Of Mineral Resources [Abstract]  
Exploration and evaluation assets
December 31, 2019December 31, 2018
Balance, beginning of year$358,935  $272,974  
Capital expenditures2,948  10,567  
Corporate acquisition (note 4)—  97,858  
Property acquisitions1,523  514  
Divestitures(443) (1,021) 
Impairment(7,822) —  
Property swaps417  —  
Exploration and evaluation expense(11,764) (21,729) 
Transfers to oil and gas properties (note 7)(16,204) (13,866) 
Foreign currency translation(7,380) 13,638  
Balance, end of year$320,210  $358,935