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Business Segment and Geographic Information - Revenue by Client Sector (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Business Segment and Geographic Information
Total revenue	$ 297,138	$ 260,840	$ 608,624	$ 534,239
Operating expenses	190,531	177,048	390,415	352,120
Operating income	106,607	83,792	218,209	182,119
Institutional
Business Segment and Geographic Information
Total revenue	181,298	160,883	378,508	336,207
Wholesale
Business Segment and Geographic Information
Total revenue	68,010	61,689	140,948	121,079
Retail
Business Segment and Geographic Information
Total revenue	26,800	18,261	46,772	36,974
Market Data
Business Segment and Geographic Information
Total revenue	$ 21,030	$ 20,007	$ 42,396	$ 39,979

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