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Share-Based Payments - Other Share Based Payment Plan (Details) - CAD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Units outstanding (in shares) 6,821 6,451
Liabilities accrued $ 235 $ 308
Compensation expense 549,000 346,000
Sun Share Units and Deferred Share Units (DSU)    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Compensation expense 205,000 87,000
Income tax expense (benefit) $ (53,000) $ (21,000)
Sun Shares    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Units outstanding (in shares) 5,967 5,521
Liabilities accrued $ 200 $ 257
DSUs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Units outstanding (in shares) 854 930
Liabilities accrued $ 35 $ 51