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Revenue and expenses (Schedule of other operating expenses) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Revenue And Expenses [Line Items]    
Other expenses $ 32,586 $ 35,119
Regional costs [Member]    
Revenue And Expenses [Line Items]    
Other expenses 4,813 3,652
(Gain) loss on disposal of PP&E and non-current assets [Member]    
Revenue And Expenses [Line Items]    
Other expenses (3,312) 7,038
Amortization of community costs (other assets) [Member]    
Revenue And Expenses [Line Items]    
Other expenses 2,720 1,768
Restructuring - Manitoba [Member]    
Revenue And Expenses [Line Items]    
Other expenses 10,609 6,947
Care & maintenance - Manitoba [Member]    
Revenue And Expenses [Line Items]    
Other expenses 9,040 0
Evaluation costs [Member]    
Revenue And Expenses [Line Items]    
Other expenses 7,964 13,293
Insurance recovery [Member]    
Revenue And Expenses [Line Items]    
Other expenses (5,698) 0
Change in other provisions (non-capital) [Member]    
Revenue And Expenses [Line Items]    
Other expenses 5,798 0
Other [Member]    
Revenue And Expenses [Line Items]    
Other expenses $ 652 $ 2,421