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Geographic Information and Business Segments - Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total revenue	$ 3,239,331	$ 1,517,492	$ 1,878,718
Income (loss) before income taxes and noncontrolling interest	1,382,837	(115,982)	696,363
Operating Segments | Market Making
Segment Reporting Information [Line Items]
Total revenue	2,593,342	1,028,094	1,384,475
Income (loss) before income taxes and noncontrolling interest	1,241,313	109,190	422,648
Operating Segments | Execution Services
Segment Reporting Information [Line Items]
Total revenue	650,143	491,736	496,333
Income (loss) before income taxes and noncontrolling interest	174,617	(126,931)	325,043
Segment Reconciling Items | Corporate
Segment Reporting Information [Line Items]
Total revenue	(4,154)	(2,338)	(2,090)
Income (loss) before income taxes and noncontrolling interest	$ (33,093)	$ (98,241)	$ (51,328)

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