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Other Comprehensive Income (Loss) (Reclassification From Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Income tax expense (benefit) $ 60,234 $ (59,993)
NET INCOME (LOSS) 16,612 354,551
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) 38,177 (2,736)
Income tax expense (benefit) (6,778) 914
NET INCOME (LOSS) 31,399 (1,822)
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 1,165 1,457
Income tax expense (benefit) (245) (306)
NET INCOME (LOSS) $ 920 $ 1,151