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Intangibles - Movements in maintenance rights (Details) - Maintenance Rights - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Finite-lived Intangible Assets [Roll Forward]    
Maintenance rights at beginning of period $ 2,540,286 $ 3,292,007
EOL and MR contract maintenance rights expense (140,686) (166,512)
MR contract maintenance rights write-off offset by maintenance liability release (16,594) (242,142)
EOL contract maintenance rights write-off due to cash received (57,541) (65,506)
EOL and MR contract maintenance rights write-off due to sale of aircraft (70,505) (2,333)
Maintenance rights at end of period $ 2,254,960 $ 2,815,514