Income Taxes (Deferred Tax Liabilities and Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Deferred tax liabilities:
Deferred profit (for tax purposes) on sale to finance subsidiary	$ (44,759)	$ (53,370)
Lease revenue and related depreciation	(167,126)	(183,237)
Intangible assets	(53,334)	(52,773)
Operating lease liability	(26,135)	(27,857)
Other	(12,208)	(10,847)
Gross deferred tax liabilities	(303,562)	(328,084)
Deferred tax assets:
Depreciation	9,314	32,539
Postretirement medical benefits	18,949	20,108
Pension	16,610	16,948
Operating lease asset	31,411	31,429
Long-term incentives	3,773	5,914
Net operating and capital losses	248,099	257,186
Tax credit carry forwards	67,376	65,697
Section 163j carryforward	76,309	86,075
Tax uncertainties gross-up	3,379	4,568
Other	63,387	57,915
Gross deferred tax assets	538,607	578,379
Less: Valuation allowance	(224,922)	(206,441)
Net deferred tax assets	313,685	371,938
Total deferred taxes, net	$ 10,123	$ 43,854