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Lease obligations - Lease payments (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Disclosure Of Maturity Analysis Of Lease Payments [Line Items]  
Lease payments $ 982,387
Interest component 260,153
Lease obligations 722,234
2021  
Disclosure Of Maturity Analysis Of Lease Payments [Line Items]  
Lease payments 142,096
Interest component 44,580
Lease obligations 97,516
2022  
Disclosure Of Maturity Analysis Of Lease Payments [Line Items]  
Lease payments 118,139
Interest component 40,075
Lease obligations 78,064
2023  
Disclosure Of Maturity Analysis Of Lease Payments [Line Items]  
Lease payments 110,354
Interest component 35,760
Lease obligations 74,594
2024  
Disclosure Of Maturity Analysis Of Lease Payments [Line Items]  
Lease payments 101,467
Interest component 31,622
Lease obligations 69,845
2025  
Disclosure Of Maturity Analysis Of Lease Payments [Line Items]  
Lease payments 90,875
Interest component 27,370
Lease obligations 63,505
Thereafter  
Disclosure Of Maturity Analysis Of Lease Payments [Line Items]  
Lease payments 419,456
Interest component 80,746
Lease obligations $ 338,710