Subsequent Events - Preliminary Allocation (Details) - Agreement And Plan Of Merger - Cambridge Holdings, LLC $ in Thousands	Dec. 30, 2018 USD ($)
Subsequent Event [Line Items]
Inventory	$ 2,705
Prepaid expenses	2,418
Other assets	11,965
Property and equipment	114,008
Franchise fees	4,175
Franchise rights	207,148
Deferred taxes	725
Accounts payable	(3,557)
Accrued payroll, related taxes and benefits	(3,989)
Long-term debt	(124,879)
Lease financing obligations	(50,839)
Other liabilities	(16,607)
Net assets acquired	$ 143,273