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PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Retirement Plan Expenses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 24, 2017 | Sep. 30, 2018 | Sep. 24, 2017
Defined Benefit Plan [Abstract] |  |  |  |
Retirement plan expenses | $ 2,968 | $ 2,735 | $ 9,133 | $ 7,963

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- Definition Amount of cost (reversal of cost) for pension and other postretirement benefits. + References No definition available. + Details
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