Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Apr. 01, 2018	Dec. 31, 2017
Property and equipment, accumulated depreciation	$ 296,283	$ 289,760
Franchise rights, accumulated amortization	102,400	100,615
Franchise agreements, accumulated amortization	10,902	11,028
Favorable leases, accumulated amortization	1,938	1,943
Unfavorable leases, accumulated amortization	$ 5,404	$ 5,053
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	36,538,903	36,158,711
Common stock, shares, outstanding	35,719,500	35,436,252