Lease Costs (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 26, 2019 USD ($)	Jun. 26, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Amortization of right-of-use assets	$ 885	$ 1,881
Interest on lease liabilities	1,318	2,834
Sublease Income	(6,249)	(12,008)
Total lease costs	$ 5,397	$ 11,486
Finance leases, weighted-average remaining lease term, years	9 years	9 years
Operating leases weighted-average remaining lease term, years	9 years 6 months	9 years 6 months
Finance leases, discount rate	24.30%	24.30%
Operating leases, discount rate	6.40%	6.40%
Franchisor Owned Outlet [Member]
Lessee, Lease, Description [Line Items]
Operating lease costs	$ 2,476	$ 4,979
Variable lease costs	1,812	3,668
Franchise [Member]
Lessee, Lease, Description [Line Items]
Operating lease costs	3,611	7,076
Variable lease costs	1,512	2,938
General and Administrative Expense [Member]
Lessee, Lease, Description [Line Items]
Operating lease costs	27	53
Variable lease costs	5	10
Restructuring and Exit Costs [Member]
Lessee, Lease, Description [Line Items]
Variable lease costs	$ 0	$ 55