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Lease Expense (Details)
$ in Thousands
 3 Months Ended
Mar. 27, 2019
USD ($)
Lessee, Lease, Description [Line Items]  
Amortization of right-of-use assets $ 996
Interest on lease liabilities 1,516
Total lease costs $ 11,718
Finance leases, weighted-average remaining lease term, years 8 years 4 months 24 days
Operating leases weighted-average remaining lease term, years 8 years 3 months 18 days
Finance leases, discount rate 24.30%
Operating leases, discount rate 6.70%
Franchisor Owned Outlet [Member]  
Lessee, Lease, Description [Line Items]  
Operating lease costs $ 2,503
Variable lease costs 1,783
Franchise [Member]  
Lessee, Lease, Description [Line Items]  
Operating lease costs 3,465
Variable lease costs 1,374
General and Administrative Expense [Member]  
Lessee, Lease, Description [Line Items]  
Operating lease costs 26
Restructuring and Exit Costs [Member]  
Lessee, Lease, Description [Line Items]  
Variable lease costs $ 55