Accumulated Other Comprehensive Income (Loss) (Changes in AOCI Components) (Details) $ in Thousands	9 Months Ended
	Sep. 26, 2015 USD ($)
Accumulated Other Comprehensive Income Loss [Roll Forward]
Accumulated Other Comprehensive Loss, Beginning balance	$ (98,197)
Other comprehensive loss before reclassifications	(3,132)
Amounts reclassified from AOCI	4,117
Other comprehensive (loss) income	985
Accumulated Other Comprehensive Loss, Ending balance	(97,212)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Accumulated Other Comprehensive Loss, Beginning balance	(2,905)
Other comprehensive loss before reclassifications	(3,132)
Amounts reclassified from AOCI	0
Other comprehensive (loss) income	(3,132)
Accumulated Other Comprehensive Loss, Ending balance	(6,037)
Pension and Other Postretirement Benefits [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Accumulated Other Comprehensive Loss, Beginning balance	(95,292)
Other comprehensive loss before reclassifications	0
Amounts reclassified from AOCI	4,117
Other comprehensive (loss) income	4,117
Accumulated Other Comprehensive Loss, Ending balance	$ (91,175)