New Accounting Standards Adoption for Topic 606 Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017	Dec. 31, 2017	Jan. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle
Accrued expenses and other current liabilities	$ 103,351		$ 103,351		$ 111,624
Advertising funds restricted liabilities	96,972		96,972		62,602
Total current liabilities	252,762		252,762		227,162
Deferred income taxes	274,344		274,344		299,053
Deferred franchise fees	93,139		93,139		10,881
Total liabilities	3,649,640		3,649,640		3,523,735
Accumulated deficit	(224,120)		(224,120)		(163,289)
Accumulated other comprehensive loss	(56,450)	$ (54,247)	(56,450)	$ (54,247)	(46,198)	$ (63,241)
Total stockholders' equity	430,539	487,049	430,539	487,049	$ 573,203	$ 527,736
Franchise royalty revenue and fees	107,559	112,548	205,467	207,238
Advertising funds revenue	84,570	0	163,470	0
Total revenues	411,002	320,342	791,566	606,161
Advertising funds expense	84,570	0	163,470	0
Total costs and expenses	339,519	294,548	664,821	519,647
Operating profit	71,483	25,794	126,745	86,514
Income before income taxes	42,264	(297)	56,617	31,837
Provision for income taxes	(12,388)	(1,548)	(6,582)	(11,341)
Net income	29,876	$ (1,845)	50,035	20,496
Revenue recognized during the period related to deferred franchise fees	2,439		5,127
Deferred income tax			(2,508)	(2,496)
Other, net			(1,093)	3,296
Accrued expenses and other current liabilities			(6,034)	$ (4,051)
Revenue recognition guidance
New Accounting Pronouncements or Change in Accounting Principle
Advertising funds restricted liabilities	6,645		6,645
Deferred income taxes	(21,996)		(21,996)
Deferred franchise fees	85,561		85,561
Adjustments for franchise fees | Revenue recognition guidance
New Accounting Pronouncements or Change in Accounting Principle
Accrued expenses and other current liabilities	(1,733)		(1,733)
Advertising funds restricted liabilities	0		0
Total current liabilities	(1,733)		(1,733)
Deferred income taxes	21,587		21,587
Deferred franchise fees	(81,999)		(81,999)
Total liabilities	(62,145)		(62,145)
Accumulated deficit	62,384		62,384
Accumulated other comprehensive loss	(239)		(239)
Total stockholders' equity	62,145		62,145
Franchise royalty revenue and fees	(724)		(1,590)
Advertising funds revenue	0		0
Total revenues	(724)		(1,590)
Advertising funds expense	0		0
Total costs and expenses	0		0
Operating profit	(724)		(1,590)
Income before income taxes	(724)		(1,590)
Provision for income taxes	187		409
Net income	(537)		(1,181)
Deferred income tax			(409)
Other, net			(309)
Accrued expenses and other current liabilities			1,899
Adjustments for advertising funds | Revenue recognition guidance
New Accounting Pronouncements or Change in Accounting Principle
Accrued expenses and other current liabilities	0		0
Advertising funds restricted liabilities	(6,645)		(6,645)
Total current liabilities	(6,645)		(6,645)
Deferred income taxes	0		0
Deferred franchise fees	0		0
Total liabilities	(6,645)		(6,645)
Accumulated deficit	6,645		6,645
Accumulated other comprehensive loss	0		0
Total stockholders' equity	6,645		6,645
Franchise royalty revenue and fees	0		0
Advertising funds revenue	(84,570)		(163,470)
Total revenues	(84,570)		(163,470)
Advertising funds expense	(84,570)		(163,470)
Total costs and expenses	(84,570)		(163,470)
Operating profit	0		0
Income before income taxes	0		0
Provision for income taxes	0		0
Net income	0		0
Deferred income tax			0
Other, net			0
Accrued expenses and other current liabilities			0
Balances without adoption | Revenue recognition guidance
New Accounting Pronouncements or Change in Accounting Principle
Accrued expenses and other current liabilities	101,618		101,618
Advertising funds restricted liabilities	90,327		90,327
Total current liabilities	244,384		244,384
Deferred income taxes	295,931		295,931
Deferred franchise fees	11,140		11,140
Total liabilities	3,580,850		3,580,850
Accumulated deficit	(155,091)		(155,091)
Accumulated other comprehensive loss	(56,689)		(56,689)
Total stockholders' equity	499,329		499,329
Franchise royalty revenue and fees	106,835		203,877
Advertising funds revenue	0		0
Total revenues	325,708		626,506
Advertising funds expense	0		0
Total costs and expenses	254,949		501,351
Operating profit	70,759		125,155
Income before income taxes	41,540		55,027
Provision for income taxes	(12,201)		(6,173)
Net income	29,339		48,854
Revenue recognized during the period related to deferred franchise fees	$ 1,715		3,537
Deferred income tax			(2,917)
Other, net			(1,402)
Accrued expenses and other current liabilities			$ (4,135)