Income Taxes (Deferred Income Taxes Components) (Details 4) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred Income Tax Liabilities [Line Items]
Employee benefit obligations	$ 51,666	$ 53,307
Accounts receivable	4,160	3,770
State income tax loss carryforwards	64,381	61,826
U.S. Federal income tax loss carryforwards	58,424	64,310
Non-U.S. income tax loss carryforwards	23,850	19,937
Leases	57,564	59,072
Other	10,705	2,350
Deferred tax assets	275,247	269,758
Valuation allowance	(66,298)	(62,816)
Deferred tax assets, net	208,949	206,942
Unrealized gain on marketable equity securities	116,396	87,204
Goodwill and other intangible assets	69,358	81,593
Property, plant and equipment	21,612	19,703
Leases	48,230	49,473
Non-U.S. withholding tax	1,962	2,084
Deferred tax liabilities	798,495	666,405
Deferred Income Tax Liabilities, Net	589,546	459,463
non-U.S. [Member]
Deferred Income Tax Liabilities [Line Items]
Capital loss carryforwards	3,069	3,458
Non-U.S. income tax loss carryforwards	23,900
Valuation allowance	(15,500)
U.S. Federal [Member]
Deferred Income Tax Liabilities [Line Items]
U.S. Federal income tax loss carryforwards	58,400
U.S Federal foreign income tax credit carryforwards	1,100	1,271
State [Member]
Deferred Income Tax Liabilities [Line Items]
State income tax loss carryforwards	64,400
Capital loss carryforwards	0	36
Income tax credit carryforwards	328	421
Valuation allowance	(49,600)
Pension Plan [Member]
Deferred Income Tax Liabilities [Line Items]
Prepaid pension cost	$ 540,937	$ 426,348