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Investments (Components Of Net Realized and Unrealized Gains and Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Gain (Loss) on Investments [Line Items]        
Net realized (losses) gains on disposals of securities, fixed income securities $ (1,174) $ 2,606 $ (4,509) $ 4,570
Total net realized gains on the disposal of securities (excluding OTTI charges) 54 2,951 4,785 5,381
OTTI Charges (2,821) (1,217) (4,033) (4,692)
Net realized investment (losses) gains (2,767) 1,734 752 689
Unrealized gains (losses) recognized in income on equity securities [1] 1,115 0 (12,953) 0
Total net realized and unrealized (losses) gains (1,652) 1,734 (12,201) 689
Unrealized holding gains (losses) on equity securities 2,300   (2,700)  
Unrealized losses on equity securities sold during the period (1,200)   (10,300)  
Equity Securities [Member]        
Gain (Loss) on Investments [Line Items]        
Total net realized gains on the disposal of securities (excluding OTTI charges) 1,226 350 9,295 350
Short-Term Investments [Member]        
Gain (Loss) on Investments [Line Items]        
Total net realized gains on the disposal of securities (excluding OTTI charges) 2 0 (1) 0
Other Investments [Member]        
Gain (Loss) on Investments [Line Items]        
Total net realized gains on the disposal of securities (excluding OTTI charges) $ 0 $ (5) $ 0 $ 461
[1] Includes unrealized holding gains (losses) of: (i) $2.3 million in Second Quarter 2018 and $(2.7) million in Six Months 2018 on equity securities remaining in our portfolio as of June 30, 2018; and (ii) $(1.2) million in Second Quarter 2018 and $(10.3) million in Six Months 2018 on equity securities sold during the period.