Income Taxes (Deferred Tax Liabilities and Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Deferred tax liabilities:
Depreciation	$ 0	$ 2,031
Deferred profit (for tax purposes) on sale to finance subsidiary	(53,370)	(43,057)
Lease revenue and related depreciation	(183,237)	(205,773)
Intangible assets	(52,773)	(52,609)
Operating lease liability	(27,857)	(31,114)
Basis adjustment in subsidiary	0	(51,548)
Other	(10,847)	(13,805)
Gross deferred tax liabilities	(328,084)	(395,875)
Deferred tax assets:
Depreciation	32,539	0
Postretirement medical benefits	20,108	23,472
Pension	16,948	15,042
Operating lease asset	31,429	35,731
Long-term incentives	5,914	11,814
Net operating and capital losses	257,186	179,153
Tax credit carry forwards	65,697	65,095
Section 163j carryforward	86,075	47,802
Tax uncertainties gross-up	4,568	4,904
Other	57,915	47,736
Gross deferred tax assets	545,840	430,749
Less: Valuation allowance	(206,441)	(159,342)
Net deferred tax assets	371,938	271,407
Total deferred taxes, net	$ 43,854
Total deferred taxes, net		$ (124,468)