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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 6 Months Ended
Jul. 01, 2018
Jul. 02, 2017
Jul. 01, 2018
Jul. 02, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock-based compensation costs $ 166 $ 189 $ 233 $ 343
Portion capitalized as property and equipment [1] (3) (3) (6) (7)
Stock-based compensation expense recognized 163 $ 186 227 $ 336
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options $ 1,100   $ 1,100  
[1] Six Months Ended July 1, 2018 July 2, 2017 (in thousands)Stock-based compensation costs$233 $343Portion capitalized as property and equipment (1)(6) (7)Stock-based compensation expense recognized$227 $336