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Pension and post-retirement benefit obligations - Schedule of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Retirement Benefits [Abstract]
Service cost	$ 208	$ 185	$ 605	$ 532
Interest cost	28	40	81	115
Expected return on plan assets	(72)	(63)	(209)	(181)
Amortization of prior service cost	(47)	(44)	(136)	(125)
Amortization of actuarial losses	5	0	15	0
Net periodic benefit cost	$ 122	$ 118	$ 356	$ 341

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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