Investments (Gross Gains And Losses Realized On Sales Of Investments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investments [Abstract]
Fixed maturity securities, Realized Gain	$ 2,413	$ 549	$ 604
Fixed maturity securities, Realized Loss	(1,066)	(3,563)	(2,701)
Fixed maturity securities, Realized Gain (Loss)	1,347	(3,014)	(2,097)
Equity securities, Realized Gain	47,411	43,420	20,835
Equity securities, Realized Loss	(28,089)	(45,607)	(23,048)
Equity securities, Realized Gain (Loss)	19,322	(2,187)	(2,213)
Short-term investments, Realized Gain	177	61	21
Short-term investments, Gross Realized Losses	(2,133)	(2,429)	(20)
Short-term investments, Realized Gain (Loss)	$ (1,956)	$ (2,368)	$ 1