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Investments in marketable securities - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($) numberOfSegments	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) numberOfSegments	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) numberOfSegments
Marketable Securities [Line Items]
Fair Value	$ 71,294		$ 71,294		$ 86,293
Debt securities, available-for-sale, unrealized loss Position, number of positions | numberOfSegments	8		8		6
Accrued investment income receivable	$ 300		$ 300		$ 300
Realized gains or losses	100	$ 100	100	$ 100
Short Term Marketable Securities
Marketable Securities [Line Items]
Fair Value	71,300		71,300		86,300
Long Term Marketable Securities
Marketable Securities [Line Items]
Fair Value	$ 0		$ 0		$ 0

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Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments.

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