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Post-retirement Benefits Other Than Pension (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 28, 2015
Jun. 29, 2014
Mar. 30, 2014
Jun. 28, 2015
Jun. 29, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Remeasurement of post-retirement benefits liability $ 0 $ 0   $ 0 $ 33,907
Post-retirement benefits other than pension          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Remeasurement of post-retirement benefits liability     $ 33,900