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Supplemental cash flow information - Reconciliation of Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Changes from financing cash flows    
Repayment of long-term debt and financing fees $ (295,917) $ (388,216)
Net proceeds on issue of long-term debt 865,415 695,533
Draw on revolving credit facility 300,000 0
Repayment of revolving credit facility (300,000) 0
Payment of lease obligations (106,834) (101,812)
Proceeds from limited recourse debt 12,839 0
Long term debt    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Outstanding at beginning of period 1,768,853  
Changes from financing cash flows    
Repayment of long-term debt and financing fees (289,698)  
Net proceeds on issue of long-term debt 865,415  
Draw on revolving credit facility 300,000  
Repayment of revolving credit facility (300,000)  
Payment of lease obligations 0  
Proceeds from limited recourse debt 12,839  
Total changes from financing cash flows 588,556  
Liability-related other changes    
Finance costs 2,562  
New lease obligations 0  
Other 3,401  
Total liability-related other changes 5,963  
Outstanding at end of period 2,363,372 1,768,853
Lease obligations    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Outstanding at beginning of period 718,505  
Changes from financing cash flows    
Repayment of long-term debt and financing fees 0  
Net proceeds on issue of long-term debt 0  
Draw on revolving credit facility 0  
Repayment of revolving credit facility 0  
Payment of lease obligations (106,834)  
Proceeds from limited recourse debt  
Total changes from financing cash flows (106,834)  
Liability-related other changes    
Finance costs 0  
New lease obligations 108,763  
Other 1,800  
Total liability-related other changes 110,563  
Outstanding at end of period $ 722,234 $ 718,505