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Financial Instruments and Concentration of Risk (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Commodity Swap Contract [Member]
Dec. 31, 2010
Commodity Swap Contract [Member]
Dec. 31, 2011
Other non-current assets [Member]
Dec. 31, 2010
Other non-current assets [Member]
Dec. 31, 2010
Other long-term obligations [Member]
Oct. 13, 2010
Eastern Spruce/Pine [Member]
Commodity Swap Contract [Member]
mbf
Sep. 30, 2011
Southern Yellow Pine [Member]
Commodity Swap Contract [Member]
mbf
Oct. 18, 2010
Southern Yellow Pine [Member]
Commodity Swap Contract [Member]
mbf
Derivatives, Fair Value [Line Items]                      
Number of interest rate swap agreements 8                    
Notional amounts $ 63,250,000                    
Debentures 22,500,000                    
Medium-term notes 40,750,000                    
Swaps fixed interest rate, minimum 6.95%                    
Swaps fixed interest rate, maximum 8.89%                    
LIBOR variable interest rate, minimum 4.738%                    
LIBOR variable interest rate, maximum 7.805%                    
Fair Value of Derivative Assets 2,409,000 62,000       2,400,000 100,000        
Increase in carrying amount of debt 2,400,000 200,000                  
Fair Value of Derivative Liabilities 0 2,876,000           300,000      
Unrealized Gain (Loss) Recorded in Interest Expense Due to Changes in Fair Value of the Derivative 2,600,000 (200,000)                  
Unrealized Gain (Loss) Recorded in Interest Expense Due to the Associated Change in the Carrying Amount of Hedged Debt 2,600,000 200,000                  
Net gain recognized resulting in reduction in interest expense 1,000,000 500,000                  
Derivative liability                 33,000 31,200 14,300
Realized gain on settlement of commodity swap contract 1,200,000                    
Unrealized gains       3,300,000              
Unrealized loss         $ 2,900,000            
Customers accounting for 10% or more of revenues 0 0 1