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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

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