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Income taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Taxes [Line Items]
Net deferred tax asset	$ 60,632	$ 50,500
Non-current deferred tax assets	67,802	55,567
Non-current deferred tax liabilities	7,170	$ 5,067
Temporary differences related to investments in foreign subsidiaries	210,825
Tax Year 2009 to 2016
Income Taxes [Line Items]
Estimate of possible loss	$ 177,000

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Income Taxes [Line Items]

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Temporary differences related to investments in foreign subsidiaries

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=123427490&loc=d3e31931-109318

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences with jurisdictional netting.

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Estimated amount of loss resulting from an adverse tax position.

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