Debt $105 Million Secured Mortgage Notes Assumed Narrative (Details) (USD $)	1 Months Ended	12 Months Ended
	Nov. 30, 2011 Acres	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Debt Instrument [Line Items]
Noncash or Part Noncash Acquisition, Debt Assumed		$ 0		$ 0		$ 105,000,000
Carrying value of debt		1,574,224,000		1,270,052,000
Mortgage notes due 2017 at fixed interest rates of 4.35% [Member]
Debt Instrument [Line Items]
Noncash or Part Noncash Acquisition, Debt Assumed, Date	November 2011
Debt Instrument, Collateral	approximately 250,000 acres of timberlands
Acres of timberlands acquired	250,000
Noncash or Part Noncash Acquisition, Debt Assumed	105,000,000	0		0		105,000,000
Fixed interest rate	4.35%	4.35%	[1]
Debt instrument term	7 years
Maturity date description	August 2017
Repayments of Secured Debt		21,000,000		10,500,000
Carrying value of debt		65,165,000	[1]	76,731,000	[1]
Debt Instrument, Outstanding Principal		$ 63,000,000

[1] The mortgage notes due in 2017 were recorded at a premium of $2.2 million and $3.2 million as of December 31, 2013 and 2012, respectively. Upon maturity the liability will be $63 million.