Stock-Based Compensation Arrangements Stock-Based Compensation Arrangements - Summary of Stock-Based Compensation Expense and Associated Tax Benefit Recognized (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation costs		$ 187	$ 188	$ 531	$ 532
Portion capitalized as property and equipment	[1]	(3)	(3)	(11)	(10)
Stock-based compensation expense recognized		184	$ 185	520	522
Tax benefit recognized from stock-based compensation awards				0	$ 4
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options		$ 1,800		$ 1,800

[1] Nine Months Ended October 1, 2017 October 2, 2016 (in thousands)Stock-based compensation costs$531 $532Portion capitalized as property and equipment (1)(11) (10)Stock-based compensation expense recognized$520 $522Excess tax benefit recognized from exercise of stock-based compensation awards $— $4