Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Computed “expected” tax expense	$ 269,410	$ 148,008	$ 179,113
Tax-exempt investment income	(11,380)	(12,770)	(14,666)
Change in valuation allowance	2,974	46,238	(1,945)
Impact of foreign tax rates	(2,368)	6,753	7,700
State and local taxes	4,230	2,561	4,842
Other, net	(10,976)	(18,973)	(6,109)
Total expense	$ 251,890	$ 171,817	$ 168,935