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Concentrations of risk and geographic information - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue, Major Customer [Line Items]
Revenue	$ 891,925	$ 1,194,651	$ 1,148,337
United States [Member]
Revenue, Major Customer [Line Items]
Revenue	428,300	429,900	$ 401,100
Outside the United States [Member]
Revenue, Major Customer [Line Items]
Long-lived assets	$ 6,900	$ 11,000

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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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