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Investments (Non-Cash OTTI Credit Losses Recognized in Earnings) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Investments [Abstract]    
Balance of credit-related OTTI, beginning $ 2,958 $ 3,124
Reduction for increases in cash flows expected to be collected (55) (2)
Balance of credit-related OTTI, ending $ 2,903 $ 3,122