Goodwill (Details) $ in Thousands	12 Months Ended
	Dec. 29, 2019 USD ($) item restaurant	Dec. 30, 2018 USD ($) restaurant item	Dec. 31, 2017 USD ($)
Goodwill
Goodwill, Beginning Balance	$ 84,516	$ 86,892
Divestitures	(4,435)	(1,359)
Foreign currency adjustments	259	(1,017)
Goodwill, Ending Balance	80,340	84,516	$ 86,892
Goodwill impairment loss	0	0	0
Domestic Company-owned Restaurants
Goodwill
Goodwill, Beginning Balance	68,689	70,048
Divestitures	(4,435)	(1,359)
Goodwill, Ending Balance	$ 64,254	$ 68,689	70,048
Number of restaurants divested | restaurant	46	62
Number of domestic markets in which restaurants divested | item	2	2
International
Goodwill
Goodwill, Beginning Balance	$ 15,391	$ 16,408
Foreign currency adjustments	259	(1,017)
Goodwill, Ending Balance	15,650	15,391	16,408
Goodwill, accumulated impairment	2,300	2,300	2,300
All others
Goodwill
Goodwill, Beginning Balance	436	436
Goodwill, Ending Balance	$ 436	$ 436	$ 436