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Franchise fees receivable - Balance of Franchise Fees Receivable (Details) - Franchise fees receivable - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Franchise fees receivable	$ 4,844	$ 6,263
Less: Unamortized discount	(904)	(1,671)
Less: Allowance for uncollectible franchise fees	(40)	(35)	$ (223)
Total franchise fees receivable	$ 3,900	$ 4,557

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