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Other liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Other liabilities    
Balance at beginning of the year $ 249,852 $ 201,565
Increase for the year 106,312 94,951
Payments (67,456) (46,664)
Balance at end of the year 288,708 249,852
Aircraft and engine lease return obligation    
Other liabilities    
Balance at beginning of the year 249,466 188,879
Increase for the year 104,831 94,815
Payments (67,089) (34,228)
Balance at end of the year 287,208 249,466
Employee profit sharing    
Other liabilities    
Balance at beginning of the year 386 12,686
Increase for the year 1,481 136
Payments (367) (12,436)
Balance at end of the year $ 1,500 $ 386