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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]                      
HTM fixed income securities gains                 $ 3 $ 5 $ 2
HTM fixed income securities losses                 (1) (1) (20)
Short Term Investments Realized Gains                 0 0 0
Short Term Investments Realized Losses                 (13) 0 0
Other investment securities gains                 3 162 1
Other investment securities losses                 (4) (653) 0
Net realized investment gains $ (7,686) $ 3,688 $ 1,765 $ (2,704) $ (2,600) $ 308 $ (3,420) $ 18,883 3,562 31,537 37,703
Proceeds from sale of available-for-sale securities                 1,046,100 234,100 259,000
Fixed Income Securities [Member]                      
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]                      
AFS securities gains                 7,741 4,515 1,945
AFS securities losses                 (11,411) (312) (392)
Equity Securities [Member]                      
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]                      
AFS securities gains                 8,108 29,168 36,871
AFS securities losses                 $ (864) $ (1,347) $ (704)