Restaurant Impairment, Closure Costs and Asset Disposals Restaurant Impairment, Closure Costs and Asset Disposals (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 28, 2016 USD ($) restaurant	Jun. 30, 2015 USD ($) restaurant
Property, Plant and Equipment Impairment or Disposal [Abstract]
Restaurant impairments	$ 10,346	$ 31	$ 10,541	$ 5,944
Costs related to closure of restaurants	538	32	1,087	71
Loss on disposal of assets and other	364	187	636	321
Asset Disposals, Closure Costs and Restaurant Impairments	$ 11,248	$ 250	$ 12,264	$ 6,336
Number of restaurants impaired during the comparable periods | restaurant			12	8