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Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 31, 2020
Restricted cash $ 639,372 $ 66,597
Deferred distribution payments    
Restricted cash 8,534 2,097
Brokerage customers' cash    
Restricted cash 629,478 63,506
Guaranty deposits    
Restricted cash 791 518
Reserve with Central Bank of Russia    
Restricted cash $ 569 $ 476