Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Property and equipment, accumulated depreciation	$ 319,447	$ 289,760
Franchise rights, accumulated amortization	106,004	100,615
Franchise agreements, accumulated amortization	11,583	11,028
Favorable leases, accumulated amortization	2,129	1,943
Unfavorable leases, accumulated amortization	$ 6,019	$ 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	35,742,427	35,436,252