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Investments - Amortized Costs (Details) - Government Bonds and Fixed Income Funds - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Available-for-sale    
Amortized Cost $ 4,589 $ 5,095
Gross Unrealized Gains 178 0
Gross Unrealized Losses 0 43
Aggregate Fair Value $ 4,767 $ 5,052