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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax expense (benefit) $ (80,199) $ (46,187) $ (111,432) $ 14,047
NET INCOME (LOSS) 679,982 190,880 1,021,844 207,492
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) 3,118 (6,849) (424) 31,328
Income tax expense (benefit) (1,528) (408) (1,652) (7,186)
NET INCOME (LOSS) 1,590 (7,257) (2,076) 24,142
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 2,286 5,172 3,451
Income tax expense (benefit) (543) (480) (1,086) (725)
NET INCOME (LOSS) $ 2,043 $ 1,806 $ 4,086 $ 2,726