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Investments (OTTI) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Investments [Abstract]        
OTTI Charges $ 2,821 $ 1,217 $ 4,033 $ 4,692