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ITG Acquisition - Pro Forma Financial Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Business Acquisition [Line Items]    
Revenue $ 362,991 $ 815,053
Net income (loss) (13,619) 410,022
Net income (loss) available for common stockholders (6,673) 174,751
Pro Forma    
Business Acquisition [Line Items]    
Revenue 438,250 946,556
Net income (loss) (17,655) 368,993
Net income (loss) available for common stockholders $ (6,033) $ 154,747