Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 30, 2018
Statement of Financial Position [Abstract]
Property and equipment, accumulated depreciation	$ 340,148	$ 328,873
Franchise rights, accumulated amortization	110,051	108,021
Franchise agreements, accumulated amortization	12,299	12,022
Favorable leases, accumulated amortization	2,129	2,256
Unfavorable leases, accumulated amortization	$ 6,019	$ 6,075
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	100	100
Preferred stock, shares outstanding	100	100
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	37,007,102	36,538,903
Common stock, shares, outstanding	36,114,251	35,742,427