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Other Comprehensive Income (Loss) (Reclassification From Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Income tax expense (benefit)                 $ (71,198) $ (89,526) $ 331,223
NET INCOME (LOSS) $ 63,601 $ 243,057 $ 190,880 $ 16,612 $ 217,644 $ 104,398 $ 332,868 $ 354,551 514,151 1,009,461 $ 89,041
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)                 2,253 (13,129)  
Income tax expense (benefit)                 (5,729) 516  
NET INCOME (LOSS)                 (3,476) (12,613)  
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                 7,974 6,902  
Income tax expense (benefit)                 (1,674) (1,449)  
NET INCOME (LOSS)                 $ 6,300 $ 5,453