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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
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