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Fair Value Measurements Available-for-sale securities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Debt Securities, Available-for-sale [Line Items]        
Equity Securities, FV-NI, Gain (Loss) $ (384) $ (721) $ (74) $ (2,479)