The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.

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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

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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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Concentrations of risk and geographic information - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Revenue, Major Customer [Line Items]
Revenue	$ 292,429	$ 282,677	$ 535,137	$ 485,023
Document Period End Date			Jun. 30, 2019
United States [Member]
Revenue, Major Customer [Line Items]
Revenue	117,700	$ 107,900	$ 200,700	$ 171,700
Outside the United States [Member]
Revenue, Major Customer [Line Items]
Long-lived assets	$ 13,500		$ 13,500		$ 15,900