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Other Comprehensive Income (Loss) (Reclassification From Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax expense (benefit) $ (39,738) $ 9,132 $ (99,629) $ 1,807
NET INCOME (LOSS) 342,855 69,895 691,755 280,213
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) (787) 350 (3,523) (9,975)
Income tax expense (benefit) (1,082) (101) (168) 1,452
NET INCOME (LOSS) (1,869) 249 (3,691) (8,523)
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 net realized capital gains (losses) 1,457 2,297 2,914 4,595
Income tax expense (benefit) (306) (482) (612) (965)
NET INCOME (LOSS) $ 1,151 $ 1,815 $ 2,302 $ 3,630