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Geographic Information and Business Segments - Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Total revenue	$ 362,991	$ 815,053
Income (loss) before income taxes and noncontrolling interest	(16,204)	468,536
Market Making
Segment Reporting Information [Line Items]
Total revenue	279,221	432,536
Income (loss) before income taxes and noncontrolling interest	47,539	163,163
Execution Services
Segment Reporting Information [Line Items]
Total revenue	83,518	383,779
Income (loss) before income taxes and noncontrolling interest	(44,405)	331,185
Corporate
Segment Reporting Information [Line Items]
Total revenue	252	(1,262)
Income (loss) before income taxes and noncontrolling interest	$ (19,338)	$ (25,812)

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