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Investments (Non-Cash OTTI Credit Losses Recognized in Earnings) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Investments [Abstract]        
Balance of credit-related OTTI, beginning $ 2,903 $ 3,122 $ 2,958 $ 3,124
Reduction for increases in cash flows expected to be collected (152) (55) (207) (57)
Balance of credit-related OTTI, ending $ 2,751 $ 3,067 $ 2,751 $ 3,067