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Intangibles - Finite-lived intangible assets (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Maintenance rights |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, net | $ 2,254,960 | $ 2,540,286
Lease premium, net |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, net | 722,769 | 824,167
Maintenance rights and lease premium, net |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, net | $ 2,977,729 | $ 3,364,453

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