Investments (Gains And Losses Due To Changes In Fair Value Of Investments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fixed maturity securities
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Total gains	$ (39,649)	$ 41,394	$ 104,379
Equity securities
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Total gains	107,701	32,232	90,920
Short-term investments
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Total gains	(141)	(1,014)	1,295
Investments
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Total gains	$ 67,911	$ 72,612	$ 196,594