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EMPLOYEE BENEFIT PLANS - Amounts Recognized in Accumulated Other Comprehensive Loss (Details) - Pension Plans - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 26, 2015
Amounts recognized in accumulated other comprehensive income (loss)    
Net actuarial loss $ 123,743 $ 73,412
Net prior service cost (credit) (3,300) (4,584)
Net amount recognized $ 120,443 $ 68,828