Investments (Gross Gains And Losses Realized On Sales Of Investments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Investments [Abstract]
Fixed maturity securities, Realized Gain	$ 1,884	$ 2,413	$ 549
Fixed maturity securities, Realized Loss	(4,296)	(1,066)	(3,563)
Fixed maturity securities, Realized Gain (Loss)	(2,412)	1,347	(3,014)
Equity securities, Realized Gain	75,591	47,411	43,420
Equity securities, Realized Loss	(80,134)	(28,089)	(45,607)
Equity securities, Realized Gain (Loss)	(4,543)	19,322	(2,187)
Short-term investments, Realized Gain	146	177	61
Short-term investments, Gross Realized Losses	(2,438)	(2,133)	(2,429)
Short-term investments, Realized Gain (Loss)	$ (2,292)	$ (1,956)	$ (2,368)