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Investments (Proceeds from Sales and Realized Gains and Losses) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Investments [Abstract]        
Proceeds $ 1,080 $ 5,378 $ 1,080 $ 5,378
Realized gains $ 47 73 $ 47 73
Realized losses   $ 67   $ 73