Derivative Instruments And Hedging Activities (Schedule Of Amount Of Losses (Gains) On Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
Net Sales [Member] | Designated As A Hedge [Member]
Derivative [Line Items]
Losses (gains) recognized in accumulated other comprehensive loss	$ (148)	$ (163)
Net Sales [Member] | Foreign Currency Exchange Derivatives [Member] | Designated As A Hedge [Member]
Derivative [Line Items]
Losses (gains) recognized in accumulated other comprehensive loss	132	107
Cost Of Sales [Member] | Natural Gas Fixed Swap [Member] | Not Designated As A Hedge [Member]
Derivative [Line Items]
Losses (gains) recognized in accumulated other comprehensive loss	(230)	(164)
Cost Of Sales [Member] | Pulp Fixed Swap [Member] | Designated As A Hedge [Member]
Derivative [Line Items]
Losses (gains) recognized in accumulated other comprehensive loss		197
Interest Expense [Member] | Designated As A Hedge [Member]
Derivative [Line Items]
Losses (gains) recognized in accumulated other comprehensive loss	680
Interest Expense [Member] | Interest Rate Swap [Member] | Designated As A Hedge [Member]
Derivative [Line Items]
Losses (gains) recognized in accumulated other comprehensive loss	$ (27)