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Other Comprehensive Income (Loss) (Reclassification From Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Income tax expense (benefit) $ (59,891) $ (7,325)
NET INCOME (LOSS) 348,900 210,318
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) (2,736) (10,325)
Income tax expense (benefit) 914 1,553
NET INCOME (LOSS) (1,822) (8,772)
Benefit Plan Net Actuarial Gain (Loss) [Member] | Reclassification From Accumulated Other Comprehensive Income [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other underwriting expenses 1,457 2,298
Income tax expense (benefit) (306) (483)
NET INCOME (LOSS) $ 1,151 $ 1,815