Restructuring (Restructuring And Reorganization Program By Segment) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011		Jun. 30, 2010
One-time termination benefits to employees	$ 5,926	$ 1,158	$ 10,402		$ 2,698
Residential Real Estate [Member] | 2010 Restructuring And Reorganization Program [Member]
One-time termination benefits to employees			9
Cumulative restructuring charges			1,013
Remaining one-time termination benefits to employees - to be incurred during 2011			235	[1]
Residential Real Estate [Member] | 2011 Restructuring And Reorganization Program [Member]
One-time termination benefits to employees			164
Cumulative restructuring charges			164
Remaining one-time termination benefits to employees - to be incurred during 2011
Commercial Real Estate [Member] | 2010 Restructuring And Reorganization Program [Member]
Cumulative restructuring charges			43
Commercial Real Estate [Member] | 2011 Restructuring And Reorganization Program [Member]
One-time termination benefits to employees			1,657
Cumulative restructuring charges			1,657
Remaining one-time termination benefits to employees - to be incurred during 2011
Rural Land Sales [Member] | 2010 Restructuring And Reorganization Program [Member]
Cumulative restructuring charges			793
Remaining one-time termination benefits to employees - to be incurred during 2011			173	[1]
Rural Land Sales [Member] | 2011 Restructuring And Reorganization Program [Member]
One-time termination benefits to employees			199
Cumulative restructuring charges			199
Remaining one-time termination benefits to employees - to be incurred during 2011
Forestry [Member] | 2010 Restructuring And Reorganization Program [Member]
Cumulative restructuring charges			193
Remaining one-time termination benefits to employees - to be incurred during 2011			292	[1]
Forestry [Member] | 2011 Restructuring And Reorganization Program [Member]
One-time termination benefits to employees
Cumulative restructuring charges
Remaining one-time termination benefits to employees - to be incurred during 2011
Other [Member] | 2010 Restructuring And Reorganization Program [Member]
One-time termination benefits to employees			34
Cumulative restructuring charges			3,521
Remaining one-time termination benefits to employees - to be incurred during 2011			991	[1]
Other [Member] | 2011 Restructuring And Reorganization Program [Member]
One-time termination benefits to employees			3,853
Cumulative restructuring charges			8,060
Remaining one-time termination benefits to employees - to be incurred during 2011
2010 Restructuring And Reorganization Program [Member]
One-time termination benefits to employees			43
Cumulative restructuring charges			5,563
Remaining one-time termination benefits to employees - to be incurred during 2011			1,691	[1]
2011 Restructuring And Reorganization Program [Member]
One-time termination benefits to employees			5,873
Cumulative restructuring charges			10,080
Remaining one-time termination benefits to employees - to be incurred during 2011

[1] Represents costs to be incurred from July 1, 2011 through December 31, 2011.