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Income Taxes (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2006
REIT's Book-to-Tax Difference       $ 3,000,000
Reversal of Deferred Tax Liability   2,100,000    
Addition to Deferred Tax Liability 5,700,000      
Deferred Income Tax Expense (Benefit) 0 1,441,000 0  
Income Tax Expense (Benefit), Continuing Operations 4,145,000 4,596,000 (16,648,000)  
Statutory Federal Income Tax Rate 35.00%      
Income Taxes Receivable 100,000 6,100,000    
Net Operating Loss Carryforwards 22,100,000      
Change in Valuation Allowance 900,000 300,000 300,000  
Tax Benefits from Stock Compensation Plans not included in Deferred Tax Assets 1,000,000      
Increase in Additional Paid-in Capital due to Excess Tax Benefits that Reduce Cash Taxes Payable 400,000      
Uncertain Tax Positions 0      
Net Tax Benefit Recognized Related to Interest and Penalties in Tax Provision 0 200,000 1,400,000  
Accrued as Receivable for Interest with Respect to Open Tax Refunds 0 800,000    
Potlatch TRS [Member]
       
Income Tax Expense (Benefit), Continuing Operations   200,000    
Minimum [Member]
       
Operating Loss Carryforwards, Expiration Dates 2029      
Period State net operating losses will expire 2 years      
Maximum [Member]
       
Operating Loss Carryforwards, Expiration Dates 2030      
Period State net operating losses will expire 20 years      
Number of Years Tax Credit Carryforwards will Expire 14 years      
Maximum [Member]
       
Accrued for Payment of Interest $ 100,000 $ 100,000