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Share-Based Payments - Other Share Based Payment Plan (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Units outstanding (in shares) 5,831 6,451
Liabilities accrued $ 306 $ 308
Compensation expense 540,000 549,000
Sun Share Units and Deferred Share Units (DSU)    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Compensation expense 140,000 205,000
Income tax expense (benefit) $ (34,000) $ (53,000)
Sun Shares    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Units outstanding (in shares) 4,971 5,521
Liabilities accrued $ 258 $ 257
DSUs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Units outstanding (in shares) 860 930
Liabilities accrued $ 48 $ 51