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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) - USD ($)
$ in Thousands
Dec. 30, 2017
Dec. 31, 2016
Plans with Accumulated Benefit Obligations in Excess of Plan Assets    
Accumulated benefit obligation $ 359,965 $ 346,122
Fair value of plan assets $ 285,609 $ 242,172