Quarterly report pursuant to Section 13 or 15(d)

CASH AND CASH EQUIVALENTS - Schedule of cash and cash equivalents (Details)

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CASH AND CASH EQUIVALENTS - Schedule of cash and cash equivalents (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Cash and Cash Equivalents [Line Items]      
Cash and cash equivalents $ 493,263 $ 698,828 $ 624,572
Securities purchased under reverse repurchase agreements      
Cash and Cash Equivalents [Line Items]      
Cash and cash equivalents 238,657 248,946  
Current accounts with brokers      
Cash and Cash Equivalents [Line Items]      
Cash and cash equivalents 56,498 94,494  
Current account with National Bank (Kazakhstan)      
Cash and Cash Equivalents [Line Items]      
Cash and cash equivalents 55,819 36,726  
Current accounts with commercial banks      
Cash and Cash Equivalents [Line Items]      
Cash and cash equivalents 41,820 75,903  
Current accounts in clearing organizations      
Cash and Cash Equivalents [Line Items]      
Cash and cash equivalents 41,218 83,194  
Petty cash in bank vault and on hand      
Cash and Cash Equivalents [Line Items]      
Cash and cash equivalents 20,490 25,830  
Accounts with stock exchanges      
Cash and Cash Equivalents [Line Items]      
Cash and cash equivalents 20,040 98,521  
Current account with National Settlement Depository (Russia)      
Cash and Cash Equivalents [Line Items]      
Cash and cash equivalents 15,527 28,215  
Current account with Central Bank (Russia)      
Cash and Cash Equivalents [Line Items]      
Cash and cash equivalents 2,417 6,930  
Current account with Central Depository (Kazakhstan)      
Cash and Cash Equivalents [Line Items]      
Cash and cash equivalents $ 777 $ 69