Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 25, 2016	Dec. 27, 2015
Revenues:
Total revenues	$ 1,783,359	$ 1,713,620	$ 1,637,375
Costs and expenses:
General and administrative expenses	158,183	163,812	163,626
Depreciation and amortization	43,668	40,987	40,307
Total costs and expenses	1,630,668	1,559,319	1,501,068
Refranchising and impairment gains/(losses), net	(1,674)	10,222
Operating income	151,017	164,523	136,307
Legal settlement		898	(12,278)
Investment income	608	785	794
Interest expense	(11,283)	(7,397)	(5,676)
Income before income taxes	140,342	158,809	119,147
Income tax expense	33,817	49,717	37,183
Net income before attribution to noncontrolling interests	106,525	109,092	81,964
Income attributable to noncontrolling interests	(4,233)	(6,272)	(6,282)
Net income attributable to the Company	102,292	102,820	75,682
Calculation of income for earnings per share:
Net income attributable to the Company	102,292	102,820	75,682
Change in noncontrolling interest redemption value	1,419	567	65
Net income attributable to participating securities	(423)	(420)	(325)
Net income attributable to common shareholders	$ 103,288	$ 102,967	$ 75,422
Basic earnings per common share	$ 2.86	$ 2.76	$ 1.91
Diluted earnings per common share	$ 2.83	$ 2.74	$ 1.89
Basic weighted average common shares outstanding	36,083	37,253	39,458
Diluted weighted average common shares outstanding	36,522	37,608	40,000
Dividends declared per common share	$ 0.85	$ 0.75	$ 0.63
Domestic Company-owned restaurants
Revenues:
Total revenues	$ 816,718	$ 815,931	$ 756,307
Costs and expenses:
Operating costs (excluding depreciation and amortization shown separately below):	664,640	651,536	604,206
North America franchising
Revenues:
Total revenues	106,729	102,980	96,056
North America commissary and other
Revenues:
Total revenues	733,627	681,606	680,321
Costs and expenses:
Operating costs (excluding depreciation and amortization shown separately below):	685,206	631,475	629,423
International
Revenues:
Total revenues	126,285	113,103	104,691
Costs and expenses:
Operating costs (excluding depreciation and amortization shown separately below):	$ 78,971	$ 71,509	$ 63,506