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Lease obligations - Lease payments (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Disclosure Of Maturity Analysis Of Lease Payments [Line Items]  
Lease payments $ 1,008,096
Interest component 289,591
Lease obligations 718,505
2020  
Disclosure Of Maturity Analysis Of Lease Payments [Line Items]  
Lease payments 134,175
Interest component 44,355
Lease obligations 89,820
2021  
Disclosure Of Maturity Analysis Of Lease Payments [Line Items]  
Lease payments 111,305
Interest component 41,136
Lease obligations 70,169
2022  
Disclosure Of Maturity Analysis Of Lease Payments [Line Items]  
Lease payments 100,715
Interest component 37,453
Lease obligations 63,262
2023  
Disclosure Of Maturity Analysis Of Lease Payments [Line Items]  
Lease payments 95,606
Interest component 33,677
Lease obligations 61,929
2024  
Disclosure Of Maturity Analysis Of Lease Payments [Line Items]  
Lease payments 88,445
Interest component 30,011
Lease obligations 58,434
Thereafter  
Disclosure Of Maturity Analysis Of Lease Payments [Line Items]  
Lease payments 477,850
Interest component 102,959
Lease obligations $ 374,891