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Financial Instruments and Risk Management - Credit Risk (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of financial assets [line items]    
Current trade receivables $ 173,409 $ 107,477
Financial assets neither past due nor impaired | Current (less than 30 days)    
Disclosure of financial assets [line items]    
Current trade receivables 171,058 104,210
Financial assets neither past due nor impaired | 31-60 days    
Disclosure of financial assets [line items]    
Current trade receivables 441 1,493
Financial assets neither past due nor impaired | 61-90 days    
Disclosure of financial assets [line items]    
Current trade receivables 107 220
Financial assets past due but not impaired | Past due (more than 90 days)    
Disclosure of financial assets [line items]    
Current trade receivables $ 1,803 1,554
Trade receivable, purchasers of petroleum and natural gas    
Disclosure of financial assets [line items]    
Trade receivable typical collection period 25 days  
Trade receivable, accrued petroleum and natural gas sales    
Disclosure of financial assets [line items]    
Included in accounts receivable $ 154,000 81,300
Trade receivables    
Disclosure of financial assets [line items]    
Allowance for doubtful accounts $ 2,600 $ 2,000
Minimum | Trade receivable, joint interest receivable    
Disclosure of financial assets [line items]    
Trade receivable typical collection period 1 month  
Maximum | Trade receivable, joint interest receivable    
Disclosure of financial assets [line items]    
Trade receivable typical collection period 3 months