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Investments (OTTI) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Investments [Abstract]        
OTTI Charges $ 1,426 $ 73 $ 5,459 $ 4,765