Net Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 25, 2016	Dec. 27, 2015
Property, Plant and Equipment
Property and equipment, gross	$ 640,499	$ 617,357
Accumulated depreciation and amortization	(406,168)	(386,884)	$ (361,518)
Net property and equipment	234,331	230,473	$ 214,044
Land
Property, Plant and Equipment
Property and equipment, gross	33,994	34,009
Buildings and improvements
Property, Plant and Equipment
Property and equipment, gross	91,809	90,892
Leasehold improvements
Property, Plant and Equipment
Property and equipment, gross	125,204	112,815
Equipment and other
Property, Plant and Equipment
Property and equipment, gross	378,509	357,242
Construction in progress
Property, Plant and Equipment
Property and equipment, gross	$ 10,983	$ 22,399