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REVENUE (Narrative) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2018	Dec. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract assets	$ 0
Deferred contract costs	0
Contract liabilities	$ 5,100,000	$ 4,600,000
Online Dashboard, Mobile Applications, And Upgrade Rights
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Estimated usage period	2 years
Gift Cards
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract liabilities	$ 6,700,000	$ 7,200,000

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