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Concentrations of risk and geographic information - Schedule of Revenue by Geographic Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenue	$ 891,925	$ 1,194,651	$ 1,148,337
United States [Member]
Segment Reporting Information [Line Items]
Revenue	428,300	429,900	401,100
Americas [Member]
Segment Reporting Information [Line Items]
Revenue	483,331	523,975	494,797
Europe, Middle East and Africa [Member]
Segment Reporting Information [Line Items]
Revenue	218,670	359,187	366,438
Asia and Pacific Area Countries [Member]
Segment Reporting Information [Line Items]
Revenue	$ 189,924	$ 311,489	$ 287,102

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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