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
		Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Deferred Compensation Arrangement with Individual, Allocated Share-based Compensation Expense		$ 782	$ 0	$ 1,814	$ 0
Stock-based compensation costs		171	166	297	233
Portion capitalized as property and equipment	[1]	(5)	(3)	(15)	(6)
Share-based Payment Arrangement, Expense, after Tax		948		2,096
Stock-based compensation expense recognized			163	2,096	227
Tax benefit recognized from stock-based compensation awards		0	$ 0	15	$ 0
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount		$ 1,700		$ 1,700

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