Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Computed “expected” tax expense	$ 368,425	$ 361,133	$ 269,410
Tax-exempt investment income	(8,361)	(10,815)	(11,380)
Change in valuation allowance	(10,883)	(28,064)	2,974
Impact of foreign tax rates	5,461	(453)	(2,368)
State and local taxes	12,271	8,976	4,230
Other, net	3,644	3,950	(10,976)
Total expense	$ 370,557	$ 334,727	$ 251,890