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Related Party Transactions - Consolidated Statements of Income (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
Revenue: |  |  |  |  |  |  |
Revenue |  | $ 178,637 |  | $ 478,941 | $ 775,566 |  | $ 504,448
Shared Services Fees: |  |  |  |  |  |  |
Technology and communications |  | 9,907 |  | 26,598 | 39,285 |  | 30,013
General and administrative |  | 11,837 |  | 23,056 | 34,960 |  | 33,973
Occupancy |  | $ 3,308 |  | $ 10,732 | $ 14,686 |  | $ 14,441
Affiliated Entity |  |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |  |
Financial Designation, Predecessor and Successor [Fixed List] |  | Successor |  | Predecessor | Successor |  | Predecessor
Operating Income: |  |  |  |  |  |  |
Net interest income (expense) |  | $ 17 |  | $ 34 | $ 858 |  | $ (415)
Shared Services Fees: |  |  |  |  |  |  |
Technology and communications |  | 740 |  | 2,220 | 2,960 |  | 2,960
General and administrative |  | 180 |  | 539 | 430 |  | 719
Occupancy |  | 155 |  | 466 | 481 |  | 621
Transaction fees | Affiliated Entity |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |
Revenue |  | 59,259 |  | 159,663 | 59,643 |  | 151,695
Subscription fees | Affiliated Entity |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |
Revenue |  | 5,718 |  | 16,627 | 5,670 |  | 37,426
Commissions | Affiliated Entity |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |
Revenue |  | 12,401 |  | 34,944 | 16,186 |  | 43,315
Refinitiv market data fees | Affiliated Entity |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |
Revenue |  | $ 13,467 |  | $ 36,851 | $ 55,635 |  | $ 50,125

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