Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Computed “expected” tax expense	$ 361,133	$ 269,410	$ 148,008
Tax-exempt investment income	(10,815)	(11,380)	(12,770)
Change in valuation allowance	(28,064)	2,974	46,238
Impact of foreign tax rates	(453)	(2,368)	6,753
State and local taxes	8,976	4,230	2,561
Other, net	3,950	(10,976)	(18,973)
Total expense	$ 334,727	$ 251,890	$ 171,817