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Post-retirement Benefits Other Than Pension (Details) - Post-retirement benefits other than pension - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 28, 2015
Jun. 29, 2014
Jun. 28, 2015
Jun. 29, 2014
Postretirement benefit costs for health care and life insurance        
Service cost-benefits earned during the period $ 106 $ 68 $ 212 $ 186
Interest cost on net benefit obligation 993 1,030 1,986 2,515
Amortization of prior service credit (2,500) (3,116) (5,000) (5,483)
Amortization of actuarial loss 400 124 800 332
Total expense (credit) $ (1,001) $ (1,894) $ (2,002) $ (2,450)