Revenue Contract Balances (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jul. 01, 2018	Jul. 01, 2018	Dec. 31, 2017
Contract balances
Receivables for franchise royalties and fees	$ 45,040	$ 45,040
Restricted Accounts and Notes Receivable	45,863	45,863
Deferred franchise fees at beginning of period		102,492
Deferred franchisee fees, current	10,584	10,584
Deferred franchise fees, noncurrent	93,139	93,139	$ 10,881
Revenue recognized during the period	(2,439)	(5,127)
New deferrals due to cash received and other		6,358
Deferred franchise fees at end of period	$ 103,723	$ 103,723