Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Significant Accounting Policies
Amortization of financing costs	$ 0.7	$ 1.3	$ 1.7
Minimum
Significant Accounting Policies
Timberland harvest cycle	26 years
Maximum
Significant Accounting Policies
Timberland harvest cycle	32 years
Timber Properties
Significant Accounting Policies
Area of Land	121,612
Alabama, Florida, Georgia, Louisiana, and Texas | Timber Properties
Significant Accounting Policies
Area of Land	393,300
Internal Revenue Service (IRS) | Domestic Tax Authority
Significant Accounting Policies
Requirement to distribute taxable income (percent)	90.00%
Internal Revenue Service (IRS) | Maximum | Domestic Tax Authority
Significant Accounting Policies
Limit on investments in taxable real estate investments trusts (percent)	25.00%