Adoption of ASU 2014-09, "Revenue from Contracts with Customers" – Transaction Price Allocated to Remaining Performance Obligations (Details) - USD ($) $ in Thousands	Apr. 01, 2018	Jan. 01, 2018
Performance Obligations by Period
Total deferred revenue	$ 31,093	$ 30,574
Franchise royalties and fees
Performance Obligations by Period
Less than 1 Year	2,400
1-2 Years	2,141
2-3 Years	1,909
3-4 Years	1,681
4-5 Years	1,461
Thereafter	3,835
Total deferred revenue	13,427
Area development fees
Performance Obligations by Period
Total deferred revenue	2,600
Customer loyalty program
Performance Obligations by Period
Total deferred revenue	$ 15,022	$ 14,724