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Segment Information - Revenue Classified by Major Geographic Areas (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 315,342	$ 276,259	$ 1,028,917	$ 775,759
Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	304,726	265,606	987,918	735,504
Europe/Middle East
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	9,051	9,152	36,962	35,276
Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 1,565	$ 1,501	$ 4,037	$ 4,979

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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