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Leases - Right-Of-Use Assets (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Roll Forward]    
Right-of-use assets, beginning balance $ 13,619 $ 17,998
Additions 1,185 1,827
Modifications 1,933 17
Depreciation (5,639) (6,223)
Right-of-use assets, ending balance 11,098 13,619
Office Leases    
Leases [Roll Forward]    
Right-of-use assets, beginning balance 9,865 14,775
Additions 20 0
Modifications 1,846 (6)
Depreciation (3,799) (4,904)
Right-of-use assets, ending balance 7,932 9,865
Field Equipment    
Leases [Roll Forward]    
Right-of-use assets, beginning balance 3,089 2,254
Additions 962 1,668
Modifications 80 4
Depreciation (1,381) (837)
Right-of-use assets, ending balance 2,750 3,089
Vehicles And Other    
Leases [Roll Forward]    
Right-of-use assets, beginning balance 665 969
Additions 203 159
Modifications 7 19
Depreciation (459) (482)
Right-of-use assets, ending balance $ 416 $ 665