Acquisitions and Divestitures - Acquisitions (Details) $ in Thousands	12 Months Ended
	Dec. 25, 2016 USD ($) restaurant	Dec. 27, 2015 USD ($) restaurant	Dec. 28, 2014 USD ($) restaurant
Purchase price
Number of restaurants acquired | restaurant		7
Cash payment	$ 13,352	$ 922	$ 4,773
Fair value allocation of purchase price
Goodwill	$ 85,529	$ 79,657	$ 82,007
Multiple restaurants acquired
Purchase price
Number of restaurants acquired | restaurant	25	7	13
Cash payment	$ 13,352	$ 922	$ 4,773
Cancellation of accounts and notes receivable	406		412
Total purchase price	13,758	922	5,185
Fair value allocation of purchase price
Property and equipment	1,362	648	555
Franchise rights	2,092	113	844
Goodwill	10,166	152	3,661
Other	138	9	125
Total purchase price	$ 13,758	$ 922	$ 5,185