Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 27, 2017	Dec. 28, 2016	Dec. 30, 2015
Revenue:
Company restaurant sales	$ 390,352	$ 367,310	$ 353,073
Franchise and license revenue	138,817	139,638	138,220
Total operating revenue	529,169	506,948	491,293
Costs of company restaurant sales:
Product costs	97,825	90,487	89,660
Payroll and benefits	153,037	142,823	136,626
Occupancy	20,802	19,557	20,443
Other operating expenses	53,049	49,229	47,628
Total costs of company restaurant sales	324,713	302,096	294,357
Costs of franchise and license revenue	39,294	40,805	43,345
General and administrative expenses	66,415	67,960	66,602
Depreciation and amortization	23,720	22,178	21,472
Operating (gains), losses and other charges, net	4,329	26,910	2,366
Total operating costs and expenses, net	458,471	459,949	428,142
Operating income	70,698	46,999	63,151
Interest expense, net	15,640	12,232	9,283
Other nonoperating (income) expense, net	(1,743)	(1,109)	139
Net income before income taxes	56,801	35,876	53,729
Provision for income taxes	17,207	16,474	17,753
Net income	$ 39,594	$ 19,402	$ 35,976
Basic net income per share	$ 0.58	$ 0.26	$ 0.44
Diluted net income per share	$ 0.56	$ 0.25	$ 0.42
Basic weighted average shares outstanding	68,077	75,325	82,627
Diluted weighted average shares outstanding	70,403	77,206	84,729