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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