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Segment Reporting - Revenues Based on Location of Legal Entity (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 626,581	$ 622,249	$ 607,852	$ 604,593	$ 602,218	$ 593,106	$ 606,119	$ 551,274	$ 2,461,275	$ 2,352,717	$ 2,027,877
U.S.
Segment Reporting Information [Line Items]
Revenues									1,544,777	1,555,133	1,372,116
U.K.
Segment Reporting Information [Line Items]
Revenues									421,125	389,338	302,576
All other foreign countries
Segment Reporting Information [Line Items]
Revenues									$ 495,373	$ 408,246	$ 353,185

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).

+ References

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