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Other Comprehensive Income (Loss) (Reclassification From Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Income tax expense (benefit) $ (31,233) $ 60,234
NET INCOME (LOSS) 341,862 16,612
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) (3,542) 38,177
Income tax expense (benefit) (124) (6,778)
NET INCOME (LOSS) (3,666) 31,399
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 2,586 1,165
Income tax expense (benefit) (543) (245)
NET INCOME (LOSS) $ 2,043 $ 920