Variable interest entities ("VIEs") - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Variable Interest Entity [Line Items]
Notes receivable, net	$ 57,965	$ 67,931
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Notes receivable, net	$ 5,000	$ 0