Income Taxes (Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax liabilities:
Property, plant and equipment and Rail Group assets leased to others	$ (149,317)	$ (169,558)
Deferred Tax Liabilities, Intangible Assets	(13,736)	0
Equity method investments	(41,354)	(24,732)
Other	(10,228)	(7,999)
Deferred tax liabilities	(214,635)	(202,289)
Deferred tax assets:
Employee benefits	20,583	13,161
Accounts and notes receivable	3,577	2,069
Inventory	2,437	7,595
Federal income tax credits	12,005	13,075
Identifiable intangibles	0	1,213
Net operating loss carryforwards	5,259	12,766
Deferred interest (a)	2,385	6,476
Lease liability	11,072	8,473
Other	12,093	8,839
Total deferred tax assets	69,411	73,667
less: Valuation allowance	(931)	(1,185)
Net deferred tax assets	68,480	72,482
Net deferred tax liabilities	$ (146,155)	$ (129,807)