Accumulated Other Comprehensive Income (Loss) (Changes in AOCI Components) (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Loss, Beginning balance	$ (103,229)
Other comprehensive loss before reclassifications	453
Amounts reclassified from AOCI	1,594
Total other comprehensive income	2,047	$ 4,222
Accumulated Other Comprehensive Loss, Ending balance	(101,182)
Foreign Currency Translation [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Loss, Beginning balance	(5,255)
Other comprehensive loss before reclassifications	453
Amounts reclassified from AOCI	0
Total other comprehensive income	453
Accumulated Other Comprehensive Loss, Ending balance	(4,802)
Pension and Other Postretirement Benefits [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Loss, Beginning balance	(97,974)
Other comprehensive loss before reclassifications	0
Amounts reclassified from AOCI	1,594
Total other comprehensive income	1,594
Accumulated Other Comprehensive Loss, Ending balance	$ (96,380)