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Debt (Details) (USD $)
9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
April 2011 Line of Credit [Member]
Sep. 30, 2012
Senior Notes due 2022 at a fixed interest rate of 3.75% [Member]
Sep. 30, 2012
Senior Exchangeable Notes due 2015 at a fixed interest rate of 4.50% [Member]
Sep. 30, 2012
Installment note due 2014 at a fixed interest rate of 8.64% [Member]
May 15, 2012
Installment note due 2014 at a fixed interest rate of 8.64% [Member]
Apr. 09, 2012
Installment note due 2014 at a fixed interest rate of 8.64% [Member]
Debt Instrument [Line Items]                
Debt Instrument, Issuance Date       March 2012 August 2009      
Debt Instrument, Face Amount       $ 325,000,000 $ 172,500,000 $ 112,500,000    
Debt Instrument, Interest Rate, Stated Percentage       3.75% 4.50%      
Debt Instrument, Maturity Date, Description       2022 2015      
Line of Credit Facility, Maximum Amount Outstanding During Period     150,000,000          
Line of Credit Facility, Remaining Borrowing Capacity     431,000,000          
Debt Instrument, Exchange Feature, Exchange Period, Beginning Date         Sep. 30, 2012      
Debt Instrument, Exchange Feature, Exchange Period, End Date         Dec. 31, 2012      
Debt Instrument, Exchange Feature, Description         Per the indenture, in order for the notes to become exchangeable, the Company's stock price must exceed 130 percent of the exchange price for 20 trading days during a period of 30 consecutive trading days as of the last day of the quarter.      
Long-term Debt, Excluding Current Maturities 967,785,000 819,229,000     131,200,000      
Debt Covenant Requirement, Threshold of Individual Sales to Qualify as Excess Timberland Sales Proceeds           10,000,000    
Debt Covenant Requirement, Limit of Non-reinvestment of Excess Timberland Sales Proceeds           50,000,000    
Debt Covenant Requirement, Period of Repayment Offer, Period Start               April 2012
Debt Covenant Requirement, Amount of Repayment Offer               $ 59,900,000
Debt Covenant Requirement, Period of Repayment Offer, Period End             May 15, 2012  
Debt Covenant Requirement, Excess Timberland Sales Proceeds After Repayment Offer           zero