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General (Details 3) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 25, 2015
Jun. 30, 2016
Jun. 25, 2015
Service cost $ 216 $ 182 $ 432 $ 356
Interest cost 352 316 704 627
Net amortization of prior service cost and actuarial loss 91 84 182 166
Net periodic pension cost $ 659 $ 582 $ 1,318 $ 1,149