Impairment of Long-Lived Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Impaired Long-Lived Assets Held and Used
Impairment of long-lived assets	$ 1,486	$ 206
Surplus Properties
Impaired Long-Lived Assets Held and Used
Impairment of long-lived assets	1,285	41
Company-operated restaurants
Impaired Long-Lived Assets Held and Used
Impairment of long-lived assets	201	0
Restaurants leased or subleased to franchisees
Impaired Long-Lived Assets Held and Used
Impairment of long-lived assets	$ 0	$ 165