Fair Value Measurements Impairment Long-lived Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2015	Sep. 30, 2014	Sep. 29, 2015	Sep. 30, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Asset impairments and closures			$ 5,727	$ 721
Net book value of restaurant-level assets	$ 3,500		3,500
Fair Value, Measurements, Recurring | Level 3 Inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Asset impairments and closures	$ 1,050	$ 153	$ 5,727	$ 721