Income Taxes (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Income Taxes [Line Items]
Deferred tax liabilities	$ 529,000,000
Timber notes receivable maturity period	2020
Total unrecognized tax benefits	9,733,000	21,172,000
Unrecognized tax benefits that, if recognized would impact effective tax rate	6,800,000
Timberland Assets [Member]
Income Taxes [Line Items]
Deferred tax liabilities	$ 529,000,000