Acquisitions (Details) $ in Thousands	9 Months Ended
	Oct. 01, 2017 USD ($) Restaurant	Oct. 02, 2016 USD ($) Restaurant	Jan. 01, 2017 USD ($)
Identifiable assets acquired and liabilities assumed:
Goodwill	$ 743,508		$ 741,410
Acquisitions
Business Acquisition
Restaurants acquired from franchisees | Restaurant	0	2
Total consideration paid, net of cash received	$ 0	$ 2,209
Identifiable assets acquired and liabilities assumed:
Properties	0	2,218
Deferred taxes and other assets	0	9
Other liabilities	0	(18)
Total identifiable net assets	0	2,209
Goodwill	$ 0	$ 0