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Investments (Company's Sale of AFS Investments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]      
Proceeds from sales of AFS investments $ 56,155 $ 20,366 $ 28,850
Gross realized gains 32 869 125
Gross realized losses $ (695) $ (14) $ (74)