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Other Comprehensive Income (Loss) (Reclassification From Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income tax expense (benefit) $ (166,538) $ (71,198) $ (89,526)
NET INCOME (LOSS) 1,379,083 514,151 $ 1,009,461
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) 5,347 2,253  
Income tax expense (benefit) (1,731) (5,729)  
NET INCOME (LOSS) 3,616 (3,476)  
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 21,807 7,974  
Income tax expense (benefit) (4,580) (1,674)  
NET INCOME (LOSS) $ 17,227 $ 6,300