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EMPLOYEE BENEFIT PLANS - Accumulated Benefit Obligation and Fair Value of Plan Assets for Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets (Details) - Pension Plans - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 26, 2015
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Plans with Accumulated Benefit Obligations in Excess of Plan Assets |  |
Accumulated benefit obligation | $ 346,122 | $ 306,433
Fair value of plan assets | $ 242,172 | $ 253,225

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