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ITG Acquisition - Purchase Price and Goodwill (Details) - USD ($) $ / shares in Units, $ in Thousands | Mar. 01, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 1,193,697 | $ 836,583
Execution Services |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 438,405 | $ 81,291
ITG |  |  |
Business Acquisition [Line Items] |  |  |
Total cash consideration | $ 1,000,000 |  |
Acquisition value (in dollars per share) | $ 30.30 |  |
Goodwill | $ 357,334 |  |
ITG | Execution Services |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | $ 357,300 |  |

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