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Investments (Net Realized Gains (Losses) on Disposals) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Schedule of Realized Gains (Losses) on Disposals Excluding OTTI [Line Items]        
HTM fixed income securities Gains $ 0 $ 1 $ 1 $ 1
HTM fixed income securities Losses 0 (15) 0 (15)
CMLs gains 1 0 1 0
CMLs losses 0 0 0 0
Equity securities Gains 0 958 0 3,238
Equity securities Losses 0 (107) (3) (107)
Short-term investments Gains 315 2 337 16
Short-term investments Losses (1) (1) (191) (1)
Other investments Gains 0 0 0 7
Other investments Losses 0 (30) (5) (30)
Net realized investment gains on disposals 2,615 2,883 6,715 6,327
AFS Fixed Income Securities [Member]        
Schedule of Realized Gains (Losses) on Disposals Excluding OTTI [Line Items]        
AFS fixed income securities Gains 6,162 2,643 11,815 4,487
AFS fixed income securities Losses $ (3,862) $ (568) $ (5,240) $ (1,269)