Leases (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) lease restaurant	Mar. 25, 2020 USD ($) restaurant	Dec. 30, 2020 USD ($)
Lessee, Lease, Description [Line Items]
Property and equipment held under operating leases, net ("ROU asset")	$ 176,838		$ 177,129
Operating Lease, Liability	$ 198,597
Initial lease term	20 years
Number of Restaurants with lease modification | restaurant	7	3
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 4,749	$ 319
Number of restaurants primarily responsible for impairment | restaurant	1
Operating Lease, Impairment Loss		$ 500
Impairment of Right-of-Use Assets	$ 63
Minimum
Lessee, Lease, Description [Line Items]
Renewal term	4 years
Maximum
Lessee, Lease, Description [Line Items]
Renewal term	5 years
Operating Lease, Impairment Loss	$ 100
Texas
Lessee, Lease, Description [Line Items]
Number of restaurants primarily responsible for impairment | restaurant		1
Lease Not Yet Commenced [Member]
Lessee, Lease, Description [Line Items]
Number Of Leases | lease	1
Property Lease [Member]
Lessee, Lease, Description [Line Items]
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 4,749	$ 307
Equipment Lease [Member]
Lessee, Lease, Description [Line Items]
Number Of Finance Leases | lease	6
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 0	12
Property lease modification [Member]
Lessee, Lease, Description [Line Items]
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 4,700	$ 300
Facility Leases [Member]
Lessee, Lease, Description [Line Items]
Number Of Finance Leases | lease	2