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Investments (Credit Losses Recognized In Earnings on Fixed Maturity Securities Held by the Company) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Investments [Abstract]        
Balance, beginning of period $ 753 $ 200 $ 792 $ 1,325
New credit loss impairments 0 1 0 365
Additional credit loss impairments on securities previously impaired 0 0 0 0
Increases due to the passage of time on previously recorded credit losses 1 1 2 9
Reductions for securities which matured, paid down, prepaid or were sold during the period 0 (3) (40) (18)
Reductions for securities impaired to fair value during the period 0 0 0 (1,481)
Accretion of credit loss impairments previously recognized due to an increase in cash flows expected to be collected (1) (8) (1) (11)
Assets transferred to parent and affiliates 0 0 0 0
Balance, end of period $ 753 $ 189 $ 753 $ 189