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Other Comprehensive Income (Loss) (Reclassification From Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax expense (benefit) $ 14,251 $ (29,451) $ (97,181) $ (15,404)
NET INCOME (LOSS) (73,468) 243,057 948,376 450,549
URA(D) On Securities [Member] | Reclassification From Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other net realized capital gains (losses) (809) (12,678) (1,233) 18,650
Income tax expense (benefit) (579) 1,225 (2,231) (5,961)
NET INCOME (LOSS) (1,388) (11,453) (3,464) 12,689
Benefit Plan Net Gain (Loss) [Member] | Reclassification From Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other underwriting expenses 1,979 2,285 7,151 5,736
Income tax expense (benefit) (416) (479) (1,502) (1,204)
NET INCOME (LOSS) $ 1,563 $ 1,806 $ 5,649 $ 4,532