Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 25, 2020
Lessee, Lease, Description [Line Items]
Amortization of right-to-use assets	$ 20
Interest on lease liabilities	15	$ 6
Operating Lease, Cost	7,115	6,854
Short-term Lease, Cost	5	2
Variable Lease, Cost	229	118
Sublease Income	(796)	(778)
Total lease cost	6,588	6,202
Occupancy and Other Operating Expenses
Lessee, Lease, Description [Line Items]
Total lease cost	6,231	5,879
General and Administrative Expense
Lessee, Lease, Description [Line Items]
Total lease cost	116	111
Depreciation and amortization
Lessee, Lease, Description [Line Items]
Total lease cost	20
Interest Expense
Lessee, Lease, Description [Line Items]
Total lease cost	15	6
Closed-store reserve
Lessee, Lease, Description [Line Items]
Total lease cost	206	206
Property Lease [Member]
Lessee, Lease, Description [Line Items]
Amortization of right-to-use assets	20
Interest on lease liabilities	15	6
Operating Lease, Cost	6,814	6,530
Variable Lease, Cost	122	104
Sublease Income	(796)	(778)
Total lease cost	6,175	5,862
Equipment Lease [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Cost	301	324
Short-term Lease, Cost	5	2
Variable Lease, Cost	107	14
Total lease cost	$ 413	$ 340