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Investments (Summary Of Net Investment Gains (Losses) And The Change In Net Unrealized Gains On Investments) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Gain (Loss) on Securities [Line Items]        
Document Period End Date     Jun. 30, 2019  
Realized Gains $ 2,612 $ 1,895 $ 3,598 $ 2,880
Realized Losses 2,679 9,537 2,984 11,468
Net realized investment gains (losses) (67) (7,642) 614 (8,588)
Change in fair value of equity securities sold during the period 202 9,631 26,616 13,897
Change in fair value of equity securities held at the end of the period 425,518 103,260 1,010,614 (23,058)
Change in fair value of equity securities 425,720 112,891 1,037,230 (9,161)
Net investment gains (losses) 425,653 105,249 1,037,844 (17,749)
Change in net unrealized gains on available-for-sale investments included in other comprehensive income (loss) 199,754 (138,094) 418,403 (282,271)
Sales Of Fixed Maturities [Member]        
Gain (Loss) on Securities [Line Items]        
Realized Gains 1,661 1,085 1,804 1,226
Realized Losses 630 1,092 911 2,044
Sales Of Short-Term Investments [Member]        
Gain (Loss) on Securities [Line Items]        
Realized Gains 499 21 1,334 787
Realized Losses (2,049) (7,609) (2,073) (6,657)
Other [Member]        
Gain (Loss) on Securities [Line Items]        
Realized Gains 452 789 460 867
Realized Losses 0 836 0 2,767
Fixed Maturities [Member]        
Gain (Loss) on Securities [Line Items]        
Change in net unrealized gains on available-for-sale investments included in other comprehensive income (loss) 197,248 (143,593) 414,542 (281,093)
Short-Term Investments [Member]        
Gain (Loss) on Securities [Line Items]        
Change in net unrealized gains on available-for-sale investments included in other comprehensive income (loss) $ 2,506 $ 5,499 $ 3,861 $ (1,178)