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Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Restricted cash $ 42,437 $ 38,460
Brokerage customers' cash    
Restricted cash 32,622 28,931
Deferred distribution payments    
Restricted cash 8,534 8,534
Reserve with Central Bank of Russia    
Restricted cash 671 732
Guaranty deposits    
Restricted cash $ 610 $ 263