Segment Information (Details 2) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014	Dec. 28, 2014
Segment Information
Revenue from external customers		$ 398,991	$ 380,864	$ 831,275	$ 782,241
Income before income taxes		17,531	26,236	53,967	57,646
Accumulated depreciation and amortization		(353,974)		(353,974)
Net property and equipment		215,208		215,208		$ 219,457
Litigation Settlement, Expense		12,278		12,278
Operating segments | Domestic Company-owned restaurants
Segment Information
Revenue from external customers		185,962	170,000	383,249	348,193
Income before income taxes		14,617	10,651	33,097	23,936
Property and equipment, gross		211,511		211,511
Operating segments | Domestic commissaries
Segment Information
Revenue from external customers		149,007	150,581	311,340	314,628
Income before income taxes		10,702	6,846	22,502	17,277
Property and equipment, gross		109,200		109,200
Operating segments | North America franchising
Segment Information
Revenue from external customers		23,276	21,115	48,900	43,873
Income before income taxes		20,054	17,882	42,373	37,366
Operating segments | International
Segment Information
Revenue from external customers		26,326	25,573	51,752	49,202
Income before income taxes		2,279	1,903	3,623	2,635
Property and equipment, gross		27,287		27,287
Operating segments | All others
Segment Information
Revenue from external customers		14,420	13,595	36,034	26,345
Income before income taxes		(117)	(442)	326	148
Property and equipment, gross		48,471		48,471
Elimination
Segment Information
Revenue from external customers		58,899	60,352	121,464	119,475
Income before income taxes		(55)	98	(800)	(553)
Elimination | Domestic commissaries
Segment Information
Revenue from external customers		54,459	51,592	112,346	106,313
Elimination | North America franchising
Segment Information
Revenue from external customers		671	583	1,342	1,187
Elimination | International
Segment Information
Revenue from external customers		75	90	150	158
Elimination | All others
Segment Information
Revenue from external customers		3,694	8,087	7,626	11,817
Unallocated corporate
Segment Information
Income before income taxes	[1]	(29,949)	$ (10,702)	(47,154)	$ (23,163)
Property and equipment, gross		$ 172,713		$ 172,713

[1] Includes a $12.3 million legal settlement expense in the three- and six-month periods of 2015. See “Note 5” for additional information