Impairment of Long-Lived Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Impaired Long-Lived Assets Held and Used
Impairment of long-lived assets	$ 1,041	$ 361	$ 1,804	$ 12,991
Restaurants leased or subleased to franchisees
Impaired Long-Lived Assets Held and Used
Impairment of long-lived assets	95	163	95	12,654
Company-operated restaurants
Impaired Long-Lived Assets Held and Used
Impairment of long-lived assets	833	79	1,051	114
Surplus properties
Impaired Long-Lived Assets Held and Used
Impairment of long-lived assets	$ 113	$ 119	$ 658	$ 223