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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Fixed Maturity Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Proceeds from sales of securities $ 371,459 $ 488,320 $ 599,737 $ 990,273
Gross gains from sales 19,870 21,355 34,734 35,356
Gross losses from sales (9,810) (11,736) (15,500) (39,813)
Equity Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Proceeds from sales of securities 193,350 100,344 474,663 213,185
Gross gains from sales 5,803 18,172 18,107 20,756
Gross losses from sales $ (2,048) $ (1,898) $ (8,114) $ (32,081)