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REVENUE RECOGNITION Contract Liabilities (Details) - USD ($)
$ in Thousands
Jun. 29, 2019
Dec. 29, 2018
Jun. 30, 2018
Revenue from Contract with Customer [Abstract]      
Unredeemed gift cards $ 13,804 $ 14,471 $ 11,072
Unredeemed customer loyalty rewards 5,610 7,764 6,164
Contract with Customer Private label credit card 714 714 0
Total contract liabilities-current $ 20,128 $ 22,949 $ 17,236