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Lease obligations - Lease payments (Details) $ in Thousands | Dec. 31, 2019 USD ($)
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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

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