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Business Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Segment Reporting Information [Line Items]        
Franchise segment $ 17,204 $ 15,267 $ 34,985 $ 32,863
Company segment 11,478 8,845 22,481 17,391
Total revenue 37,037 31,578 74,426 64,988
Operating income 9,926 8,186 19,492 16,711
Interest expense, net 2,342 1,307 4,078 2,606
Income before taxes 7,584 6,879 15,414 14,105
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Total revenue 37,037 31,578 74,426 64,988
Operating income 9,926 8,186 20,954 16,711
Corporate, Non-Segment [Member]        
Segment Reporting Information [Line Items]        
Corporate and other [1] 0 0 1,462 0
Segment Reconciling Items [Member]        
Segment Reporting Information [Line Items]        
Interest expense, net 2,342 1,307 4,078 2,606
Franchise Segment [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Franchise segment 25,559 22,733 51,945 47,597
Operating income 7,175 7,108 15,562 14,554
Company Segment [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Company segment 11,478 8,845 22,481 17,391
Operating income $ 2,751 $ 1,078 $ 5,392 $ 2,157
[1] Corporate and other includes corporate related items not allocated to reportable segments and consists primarily of expenses associated with the refinancing of the 2016 Facility and payment of a special dividend.