Accumulated Other Comprehensive Income (Loss) (Changes in AOCI Components) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 28, 2015
Accumulated Other Comprehensive Income Loss [Roll Forward]
Accumulated Other Comprehensive Loss, Beginning balance	$ (98,197)
Other comprehensive loss before reclassifications	(1,330)
Amounts reclassified from AOCI	1,342
Other comprehensive (loss) income	12
Accumulated Other Comprehensive Loss, Ending balance	(98,185)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Accumulated Other Comprehensive Loss, Beginning balance	(2,905)
Other comprehensive loss before reclassifications	(1,330)
Amounts reclassified from AOCI	0
Other comprehensive (loss) income	(1,330)
Accumulated Other Comprehensive Loss, Ending balance	(4,235)
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	1,342
Other comprehensive (loss) income	1,342
Accumulated Other Comprehensive Loss, Ending balance	$ (93,950)