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RESTRICTED CASH (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Mar. 31, 2021
Restricted cash $ 419,046 $ 437,958
Brokerage customers' cash    
Restricted cash 409,283 427,233
Deferred distribution payments    
Restricted cash 8,534 8,534
Reserve with Central Bank of Russia    
Restricted cash 1,141 1,758
Guaranty deposits    
Restricted cash $ 88 $ 433