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Financial instruments - Measurement of fair values (Details) - CAD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financial assets [Abstract]      
Cash and cash equivalents $ 591,620 $ 320,278 $ 458,604
Derivative assets 40,804 10,612  
Accounts receivable 396,824 242,482  
Investments in equity securities 21,417 14,807  
Advances receivable from JV Inkai LLP 58,820 90,095  
Other   4,966  
Financial assets 1,109,485 683,240  
Financial liabilities [Abstract]      
Accounts payable and accrued liabilities 258,405 312,900  
Dividends payable 39,579 39,579  
Derivative liabilities 23,414 58,885  
Long-term debt 1,494,471 1,493,327  
Financial liabilities 1,815,869 1,904,691  
Net financial assets and liabilities (706,384) (1,221,451)  
Foreign currency contracts [Member]      
Financial assets [Abstract]      
Derivative assets 39,984 4,065  
Financial liabilities [Abstract]      
Derivative liabilities 5,624 29,231  
Interest rate contracts [member]      
Financial assets [Abstract]      
Derivative assets 820 6,547  
Financial liabilities [Abstract]      
Derivative liabilities 970    
Uranium contracts [Member]      
Financial liabilities [Abstract]      
Derivative liabilities 16,820 29,654  
Fair value through profit or loss [member]      
Financial liabilities [Abstract]      
Financial liabilities 23,414 58,885  
Net financial assets and liabilities 17,390 (48,273)  
Fair value through profit or loss [member] | Foreign currency contracts [Member]      
Financial liabilities [Abstract]      
Derivative liabilities 5,624 29,231  
Fair value through profit or loss [member] | Interest rate contracts [member]      
Financial liabilities [Abstract]      
Derivative liabilities 970    
Fair value through profit or loss [member] | Uranium contracts [Member]      
Financial liabilities [Abstract]      
Derivative liabilities 16,820 29,654  
Other financial liabilities [member]      
Financial liabilities [Abstract]      
Accounts payable and accrued liabilities 258,405 312,900  
Dividends payable 39,579 39,579  
Long-term debt 1,494,471 1,493,327  
Financial liabilities 1,792,455 1,845,806  
Net financial assets and liabilities (1,792,455) (1,845,806)  
Fair value through profit or loss [member]      
Financial assets [Abstract]      
Financial assets 40,804 10,612  
Fair value through profit or loss [member] | Foreign currency contracts [Member]      
Financial assets [Abstract]      
Derivative assets 39,984 4,065  
Fair value through profit or loss [member] | Interest rate contracts [member]      
Financial assets [Abstract]      
Derivative assets 820 6,547  
Loans and receivables [member]      
Financial assets [Abstract]      
Cash and cash equivalents 591,620 320,278  
Accounts receivable 396,824 242,482  
Advances receivable from JV Inkai LLP 58,820 90,095  
Other   4,966  
Financial assets 1,047,264 657,821  
Financial liabilities [Abstract]      
Net financial assets and liabilities 1,047,264 657,821  
Available for sale [member]      
Financial assets [Abstract]      
Investments in equity securities 21,417 14,807  
Financial assets 21,417 14,807  
Financial liabilities [Abstract]      
Net financial assets and liabilities $ 21,417 $ 14,807