Restaurant Impairment, Closure Costs and Asset Disposals Restaurant Impairment, Closure Costs and Asset Disposals (Details) $ in Thousands	3 Months Ended
	Apr. 02, 2019 USD ($) restaurant	Apr. 03, 2018 USD ($) restaurant
Property, Plant and Equipment Impairment or Disposal [Abstract]
Restaurant impairments	$ 189	$ 598
Closure costs	(39)	554
Loss on disposal of assets and other	(270)	(428)
Asset Disposals, Closure Costs and Restaurant Impairments	$ 420	$ 1,580
Number of restaurants impaired during the comparable periods | restaurant	0	1
Closure costs relating to assessment of operating lease terms	$ (300)
Impairment closure costs and other	300	$ 600
Gain on disposal	$ 400