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Employee Benefit Plans (Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
Dec. 26, 2015
Dec. 27, 2014
Pension Plans    
Amounts recognized in accumulated other comprehensive income (loss)    
Net actuarial loss $ 66,499 $ 73,433
Net prior service cost (credit) (4,584) (5,388)
Net amount recognized 61,915 68,045
Other Post-Retirement Benefit Plans    
Amounts recognized in accumulated other comprehensive income (loss)    
Net actuarial loss 6,913 5,761
Net prior service cost (credit) 0 0
Net amount recognized $ 6,913 $ 5,761