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Debt - $105 Million Secured Mortgage Notes Assumed (Narrative) (Details)
$ in Millions
1 Months Ended 12 Months Ended
Aug. 31, 2017
USD ($)
Nov. 30, 2011
USD ($)
a
Dec. 31, 2017
a
Dec. 31, 2016
USD ($)
a
Debt Instrument [Line Items]        
Timberlands acquired (acres) | a   250,000 109,533 110,727
Mortgage notes due 2017 at fixed interest rates of 4.35%        
Debt Instrument [Line Items]        
Notes assumed   $ 105.0    
Fixed interest rate   4.35% 4.35%  
Debt instrument, term   7 years    
Repayments   $ 21.0   $ 10.5
Mortgage notes due 2017 at fixed interest rates of 4.35%        
Debt Instrument [Line Items]        
Remaining principal repaid $ 31.5