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Business Segment and Geographic Information - Revenue by Client Sector (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
Business Segment and Geographic Information |  |  |  |  |  |  |
Financial Designation, Predecessor and Successor [Fixed List] | Successor | Successor | Successor | Predecessor | Successor | Successor | Predecessor
Gross revenues |  | $ 178,637 |  | $ 505,771 | $ 775,566 |  | $ 562,968
Contingent consideration |  |  |  | (26,830) |  |  | (58,520)
Net revenue |  | 178,637 |  | 478,941 | 775,566 |  | 504,448
Operating expenses |  | 146,702 |  | 338,607 | 585,747 |  | 415,356
Operating income |  | 31,935 |  | 140,334 | 189,819 |  | 89,092
Institutional |  |  |  |  |  |  |
Business Segment and Geographic Information |  |  |  |  |  |  |
Gross revenues |  | 103,971 |  | 301,918 | 453,379 |  | 318,038
Wholesale |  |  |  |  |  |  |
Business Segment and Geographic Information |  |  |  |  |  |  |
Gross revenues |  | 38,153 |  | 99,028 | 171,096 |  | 118,451
Retail |  |  |  |  |  |  |
Business Segment and Geographic Information |  |  |  |  |  |  |
Gross revenues |  | 19,780 |  | 57,766 | 80,368 |  | 70,857
Market Data |  |  |  |  |  |  |
Business Segment and Geographic Information |  |  |  |  |  |  |
Gross revenues |  | $ 16,733 |  | $ 47,059 | $ 70,723 |  | $ 55,622

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