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SUPPLEMENTAL BALANCE SHEET INFORMATION (Details) - USD ($)
$ in Thousands
Sep. 27, 2017
Dec. 28, 2016
Other Liabilities, Current    
Sales tax payable $ 1,539 $ 1,324
Current portion of liabilities under tax receivable agreement 3,140 4,580
Gift card liability 1,003 1,153
Deferred Compensation Liability, Current 2,400 0
Other 1,735 3,116
Other current liabilities $ 9,817 $ 10,173