Timberland Acquisitions (Details) (USD $)	12 Months Ended			3 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Acquired timberlands in Texas acre	Dec. 31, 2011 Acquired timberland primarily located in MS, LA, OK and AL [Member] acre	Dec. 31, 2012 Other timberland acquisitions [Member] acre	Dec. 31, 2011 Other timberland acquisitions [Member] acre
Significant Acquisitions and Disposals [Line Items]
Significant Acquisitions and Disposals, Type				asset purchase	asset purchase	asset purchases	asset purchases
Acquisition Date				December 2012	fourth quarter of 2011	throughout 2012	throughout 2011
Acres of Timberlands Acquired				63,000	250,000	25,000	58,000
Description				Texas	timberland primarily located in Mississippi, Louisiana, Oklahoma and Alabama	located in Alabama, Florida and Texas	located in Florida, Georgia and Louisiana
Acquisition Purchase Price				$ 88,000,000	$ 332,000,000	$ 19,000,000	$ 94,000,000
Payments to Acquire Productive Assets					107,000,000
Funding from Existing Revolving Credit Facility				30,000,000	120,000,000
Funding from Assumption of Seller's Existing Debt	$ 0	$ 105,000,000	$ 0		$ 105,000,000
Terms				cash on hand		funded with cash on hand	funded with cash on hand or through the revolving credit facility