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Investments (Net Realized Gains (Losses) on Disposals) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Schedule of Realized Gains (Losses) on Disposals Excluding OTTI [Line Items]    
HTM fixed income securities Gains $ 1 $ 0
HTM fixed income securities Losses 0 0
Equity securities Gains 0 2,280
Equity securities Losses (3) 0
Short-term investments Gains 22 14
Short-term investments Losses (190) 0
Other investments Gains 0 7
Other investments Losses (5) 0
Net realized investment gains on disposals 4,100 3,444
Fixed Maturities [Member]    
Schedule of Realized Gains (Losses) on Disposals Excluding OTTI [Line Items]    
AFS securities Gains 5,653 1,844
AFS securities Losses $ (1,378) $ (701)