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Other Comprehensive Income (Loss) (Reclassification From Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                            
Income tax expense (benefit)     $ (39,477) $ (59,993)   $ 8,910 $ 9,633 $ (7,426) $ (99,470) $ 2,207 $ 11,117 $ (89,526) $ 331,223 $ 63,340
NET INCOME (LOSS) $ 217,644 $ 104,398 $ 332,868 $ 354,551 $ (385,313) $ 198,381 $ 60,787 $ 215,186 $ 687,419 $ 275,973 $ 474,354 1,009,461 89,041 $ 482,751
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)                       (13,129) 28,014  
Income tax expense (benefit)                       516 (518)  
NET INCOME (LOSS)                       (12,613) 27,496  
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                       6,902 6,356  
Income tax expense (benefit)                       (1,449) (1,335)  
NET INCOME (LOSS)                       $ 5,453 $ 5,021