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Investments (Proceeds from Sales of Securities and Realized Gains and Losses) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Investments [Abstract]        
Proceeds $ 2,005 $ 0 $ 2,005 $ 18,530
Realized gains 6 0 151 52
Realized losses $ 16 $ 27 $ 35 $ 96