Other Assets - Components of Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Other Assets [Abstract]
Land and buildings	$ 20,303	$ 20,303
Capitalized franchise sales commissions (refer to Note 2)	55,535	54,272
Other assets	14,183	13,821
Total other assets	$ 90,021	$ 88,396