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Other Comprehensive Income (Loss) (Reclassification From Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax expense (benefit) $ 3,507 $ (80,199) $ (588) $ (111,432)
NET INCOME (LOSS) 122,630 679,982 420,381 1,021,844
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) 16,467 3,118 21,369 (424)
Income tax expense (benefit) (626) (1,528) (1,350) (1,652)
NET INCOME (LOSS) 15,841 1,590 20,019 (2,076)
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 959 2,586 1,919 5,172
Income tax expense (benefit) (201) (543) (404) (1,086)
NET INCOME (LOSS) $ 758 $ 2,043 $ 1,515 $ 4,086