Income Taxes (Deferred Tax Liabilities and Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax liabilities:
Depreciation	$ (51,717)	$ (85,544)
Deferred profit (for tax purposes) on sale to finance subsidiary	(26,765)	(26,745)
Lease revenue and related depreciation	(216,282)	(202,862)
Intangible assets	(65,916)	(76,672)
Operating lease liability	(73,403)	(46,496)
Other	(27,366)	(25,438)
Gross deferred tax liabilities	(461,449)	(463,757)
Deferred tax assets:
Postretirement medical benefits	24,892	34,681
Pension	9,640	20,472
Operating lease asset	78,765	52,271
Long-term incentives	12,946	12,308
Net operating and capital losses	130,640	125,699
Tax credit carry forwards	66,256	65,931
Section 163j carryforward	23,917	10,556
Tax uncertainties gross-up	4,982	6,929
Other	50,345	38,641
Gross deferred tax assets	402,383	367,488
Less: Valuation allowance	(157,450)	(121,778)
Net deferred tax assets	244,933	245,710
Total deferred taxes, net	$ (216,516)	$ (218,047)