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Other Comprehensive Income (Loss) (Reclassification From Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Income tax expense (benefit) $ (4,096) $ (31,233)
NET INCOME (LOSS) 297,751 341,862
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) 4,902 (3,542)
Income tax expense (benefit) (724) (124)
NET INCOME (LOSS) 4,178 (3,666)
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 960 2,586
Income tax expense (benefit) (202) (543)
NET INCOME (LOSS) $ 758 $ 2,043