Leases - Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]
Variable lease cost	$ 4,105	$ 3,800
Sublease income	(122)	(178)
Amortization of right-of-use assets	445	476
Interest on lease liabilities	46	71
Total lease cost	30,043	22,537
Restaurant Rent Expense [Member]
Loans and Leases Receivable Disclosure [Line Items]
Operating lease cost	25,471	18,294
General and Administrative Expense [Member]
Loans and Leases Receivable Disclosure [Line Items]
Operating lease cost	$ 98	$ 74