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ITG Acquisition - Tax Treatment of the ITG Acquisition (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Mar. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Deferred tax assets | $ 215,063 |  | $ 200,359
ITG |  |  |
Business Acquisition [Line Items] |  |  |
Deferred tax assets |  | $ 17,200 |
Deferred tax liabilities |  | $ 65,900 |

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