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Commitments And Contingencies (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
A
Dec. 31, 2010
Dec. 31, 2009
Commitments And Contingencies [Line Items]      
Authorized capital commitments $ 40,400,000 $ 143,300,000  
Area leased under timberland cutting rights (acres) 88,000    
Total lease expense 46,100,000 42,000,000 41,300,000
Capital lease obligations 21,832,000 22,502,000  
Purchase commitments, amount 28,500,000 32,800,000 37,300,000
Number of lawsuits filed by the plaintiffs 5    
Number of other U.S. and Canadian containerboard producers PCA and eight other U.S. and Canadian containerboard producers were named as defendants    
Remediation costs 3,200,000    
Environmental reserve 10,500,000    
Counce And Valdosta Mills [Member]
      
Commitments And Contingencies [Line Items]      
Authorized capital commitments   109,200,000  
Minimum [Member]
      
Commitments And Contingencies [Line Items]      
Purchase commitments term, years one    
Maximum [Member]
      
Commitments And Contingencies [Line Items]      
Purchase commitments term, years twenty    
Operating Leases [Member] | Minimum [Member]
      
Commitments And Contingencies [Line Items]      
Lease term, years one    
Operating Leases [Member] | Maximum [Member]
      
Commitments And Contingencies [Line Items]      
Lease term, years 14    
Capital Leases [Member]
      
Commitments And Contingencies [Line Items]      
Interest paid, capital lease obligations $ 1,500,000 $ 1,600,000 $ 1,600,000