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ALLOWANCE FOR CREDIT LOSSES (Tables)
 12 Months Ended
Dec. 31, 2021
Credit Loss [Abstract]  
Allowance For Credit Losses Of Receivables From Users
The following table summarizes the allowance for credit losses, which primarily relate to unsecured balances of receivables from Fraudulent Deposit Transactions and losses on margin borrowings, for the periods indicated:
Year ended December 31,
(in thousands)201920202021
Beginning balance$6,013 $17,122 $34,092 
Provision for credit losses11,109 59,134 78,337 
Write-offs— (42,164)(72,213)
Ending balance$17,122 $34,092 $40,216