Restructuring (Restructuring And Reorganization Program By Segment) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011		Sep. 30, 2010
Restructuring Cost and Reserve [Line Items]
One-time termination benefits to employees	$ 348	$ 1,654	$ 10,750		$ 4,352
Residential Real Estate [Member] | 2010 Restructuring And Reorganization Program [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring charges			1,013
Remaining one-time termination benefits to employees - to be incurred during 2011			186	[1]
Residential Real Estate [Member] | 2011 Restructuring And Reorganization Program [Member]
Restructuring Cost and Reserve [Line Items]
One-time termination benefits to employees			80
Cumulative restructuring charges			244
Commercial Real Estate [Member] | 2010 Restructuring And Reorganization Program [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring charges			43
Commercial Real Estate [Member] | 2011 Restructuring And Reorganization Program [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring charges			1,657
Rural Land Sales [Member] | 2010 Restructuring And Reorganization Program [Member]
Restructuring Cost and Reserve [Line Items]
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]
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring charges			199
Forestry [Member] | 2010 Restructuring And Reorganization Program [Member]
Restructuring Cost and Reserve [Line Items]
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]
Restructuring Cost and Reserve [Line Items]
One-time termination benefits to employees			77
Cumulative restructuring charges			77
Other [Member] | 2010 Restructuring And Reorganization Program [Member]
Restructuring Cost and Reserve [Line Items]
One-time termination benefits to employees			84
Cumulative restructuring charges			3,605
Remaining one-time termination benefits to employees - to be incurred during 2011			733	[1]
Other [Member] | 2011 Restructuring And Reorganization Program [Member]
Restructuring Cost and Reserve [Line Items]
One-time termination benefits to employees			108
Cumulative restructuring charges			8,168
2010 Restructuring And Reorganization Program [Member]
Restructuring Cost and Reserve [Line Items]
One-time termination benefits to employees			84
Cumulative restructuring charges			5,647
Remaining one-time termination benefits to employees - to be incurred during 2011			1,384	[1]
2011 Restructuring And Reorganization Program [Member]
Restructuring Cost and Reserve [Line Items]
One-time termination benefits to employees			265
Cumulative restructuring charges			$ 10,345

[1] Represents costs to be incurred from October 1, 2011 through December 31, 2012.