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EMPLOYEE BENEFIT PLANS - Projected Benefit Obligation and Fair Value of Plan Assets for Pension Plans with Projected Benefit Obligations in Excess of Plan Assets (Details) - Pension Plans - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 26, 2015
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Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation | $ 379,942 | $ 336,155
Fair value of plan assets | $ 256,903 | $ 266,154

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