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Investments (Components Of Net Realized Gains, Excluding OTTI Charges) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]                      
HTM fixed income securities gains                 $ 44 $ 3 $ 5
HTM fixed income securities losses                 (1) (1) (1)
Short Term Investments Realized Gains                 (2) 0 0
Short Term Investments Realized Losses                 (6) (13) 0
Other investment securities gains                 494 3 162
Other investment securities losses                 (859) (4) (653)
Net realized investment gains $ (1,128) $ 6,798 $ 1,734 $ (1,045) $ (7,686) $ 3,688 $ 1,765 $ (2,704) 11,204 3,562 31,537
Proceeds from sale of available-for-sale securities                 1,235,900 1,046,100 234,100
Fixed Income Securities [Member]                      
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]                      
AFS securities gains                 10,193 7,741 4,515
AFS securities losses                 (3,292) (11,411) (312)
Equity Securities [Member]                      
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]                      
AFS securities gains                 5,829 8,108 29,168
AFS securities losses                 $ (1,200) $ (864) $ (1,347)