Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2019	Jun. 27, 2018	Jun. 26, 2019	Jun. 27, 2018
Revenue:
Total operating revenue	$ 151,884	$ 157,334	$ 303,295	$ 312,607
Costs of company restaurant sales, excluding depreciation and amortization:
Product costs	23,363	25,054	47,268	49,989
Payroll and benefits	36,866	41,065	76,698	82,291
Occupancy	5,498	5,435	11,282	11,082
Other operating expenses	14,103	15,021	28,695	30,071
Total costs of company restaurant sales	79,830	86,575	163,943	173,433
Costs of franchise and license revenue, excluding depreciation and amortization	28,871	29,049	55,929	57,605
General and administrative expenses	18,453	15,597	37,264	32,157
Depreciation and amortization	5,048	6,691	11,281	13,205
Operating (gains), losses and other charges, net	(26,433)	462	(35,368)	822
Total operating costs and expenses, net	105,769	138,374	233,049	277,222
Operating income	46,115	18,960	70,246	35,385
Interest expense, net	5,382	5,385	10,789	10,010
Other nonoperating income, net	(273)	(629)	(1,696)	(417)
Income before income taxes	41,006	14,204	61,153	25,792
Provision for income taxes	6,767	2,578	11,424	4,407
Net income	$ 34,239	$ 11,626	$ 49,729	$ 21,385
Basic net income per share	$ 0.57	$ 0.18	$ 0.82	$ 0.33
Diluted net income per share	$ 0.55	$ 0.18	$ 0.79	$ 0.32
Basic weighted average shares outstanding	60,290	63,644	60,970	64,038
Diluted weighted average shares outstanding	62,082	66,128	62,937	66,552
Franchisor Owned Outlet [Member]
Revenue:
Total operating revenue	$ 95,447	$ 102,741	$ 193,992	$ 203,934
Franchise [Member]
Revenue:
Total operating revenue	$ 56,437	$ 54,593	$ 109,303	$ 108,673