Investments (Summary Of Gross Gains (Losses) From Sales Of Fixed Maturity And Equity Securities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of securities	$ 403,419	$ 214,942	$ 2,007,308	$ 369,923
Gross gains from sales	3,133	2,066	11,237	8,993
Gross losses from sales	(5,090)	(3,306)	(9,768)	(4,117)
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of securities	79,735	301,448	148,973	429,927
Gross gains from sales	2,577	4,678	8,248	7,906
Gross losses from sales	$ (3,891)	$ (6,279)	$ (4,518)	$ (11,988)