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Related Party Transactions - Balances (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Related Party Transactions |  |  |  |  |  |  |
Financial Designation, Predecessor and Successor [Fixed List] | Successor | Successor | Successor | Predecessor | Successor | Successor | Predecessor
Cash and cash equivalents |  | $ 283,790 |  |  |  | $ 283,790 |
Receivables from brokers and dealers and clearing organizations |  | 3,332 |  |  |  | 3,332 |
Deposits with clearing organizations |  | 500 |  |  |  | 500 |
Accounts receivable |  | 40,730 |  |  |  | 40,730 |
Receivable from affiliates |  | 3,243 | $ 2,525 |  | $ 2,525 | 3,243 |
Other assets |  | 9 |  |  |  | 9 |
Payable to brokers and dealers and clearing organizations |  | 2,404 |  |  |  | 2,404 |
Deferred revenue |  | 9,151 | 4,733 |  | 4,733 | 9,151 |
Payable to affiliates |  | $ 5,009 | $ 1,506 |  | $ 1,506 | $ 5,009 |

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