XML 102 R75.htm IDEA: XBRL DOCUMENT v3.20.4
Income Taxes - Additional Information (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2016
Income Taxes [Abstract]      
Deferred tax assets, unrecognized $ 469,700 $ 28,000  
Unrecognized deferred tax assets, deductible temporary differences 854,200    
Unrecognized deferred tax assets, capital losses 237,900    
Unrecognized deferred tax assets. non-capital losses 1,015,200    
Accumulated non-capital losses     $ 591,000
Effect of U.S. tax change $ 19,807