Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Deferred tax assets:
Accrued benefits	$ 34,033	$ 34,096
Net operating loss carryforward	64,774	89,030
Aircraft maintenance contracts	93,737	86,965
Deferred revenue	70,525	83,724
Operating lease liabilities	20,037	21,452
Interest deduction limitation		2,333
Accrued reserves and other	59,459	47,486
Total deferred tax assets	342,565	365,086
Deferred tax liabilities:
Accelerated depreciation	(1,214,016)	(1,131,670)
Operating lease right-of-use assets	(20,037)	(21,384)
Other	(19,243)
Total deferred tax liabilities	(1,253,296)	(1,153,054)
Net deferred tax liability	$ (910,731)	$ (787,968)