Summary of Significant Accounting Policies - Fair Value Measurements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2018	Dec. 27, 2017	Dec. 28, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment owned, net	$ 104,145	$ 102,794
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment owned, net	449	0	$ 1,614
Impairment Losses	5,147	32,594	8,400
Fair Value, Measurements, Nonrecurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment owned, net	0	0	0
Fair Value, Measurements, Nonrecurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment owned, net	0	0	0
Fair Value, Measurements, Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment owned, net	$ 449	$ 0	$ 1,614