Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Computed “expected” tax expense	$ 475,543	$ 368,425	$ 361,133
Tax-exempt investment income	(7,110)	(8,361)	(10,815)
Change in valuation allowance	(220)	(10,883)	(28,064)
Impact of foreign operations and related tax rates	19,317	(1,896)	(3,444)
State and local taxes, net of federal benefit	12,329	12,271	8,976
Other, net	10,057	11,001	6,941
Total expense	$ 509,916	$ 370,557	$ 334,727