Restructuring (Charges Associated With The Relocation And Restructuring Programs By Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Restructuring Cost and Reserve [Line Items]
One-time termination benefits to employees	$ 55	$ 4,476
2011 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
One-time termination benefits to employees	2	4,207
Cumulative restructuring charges	10,933
Remaining one-time termination benefits to employees - to be incurred during 2012
2011 Restructuring Program [Member] | Residential Real Estate [Member]
Restructuring Cost and Reserve [Line Items]
One-time termination benefits to employees	1
Cumulative restructuring charges	624
Remaining one-time termination benefits to employees - to be incurred during 2012
2011 Restructuring Program [Member] | Commercial Real Estate [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring charges	1,659
Remaining one-time termination benefits to employees - to be incurred during 2012
2011 Restructuring Program [Member] | Rural Land Sales [Member]
Restructuring Cost and Reserve [Line Items]
One-time termination benefits to employees	1
Cumulative restructuring charges	209
Remaining one-time termination benefits to employees - to be incurred during 2012
2011 Restructuring Program [Member] | Forestry [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring charges	77
Remaining one-time termination benefits to employees - to be incurred during 2012
2011 Restructuring Program [Member] | Other [Member]
Restructuring Cost and Reserve [Line Items]
One-time termination benefits to employees		4,207
Cumulative restructuring charges	8,364
Remaining one-time termination benefits to employees - to be incurred during 2012
2010 Restructuring And Relocation Program [Member]
Restructuring Cost and Reserve [Line Items]
One-time termination benefits to employees	53	269
Cumulative restructuring charges		5,700
Remaining one-time termination benefits to employees - to be incurred during 2012	8
2010 Restructuring And Relocation Program [Member] | Residential Real Estate [Member]
Restructuring Cost and Reserve [Line Items]
One-time termination benefits to employees	22	43
Cumulative restructuring charges		1,035
2010 Restructuring And Relocation Program [Member] | Commercial Real Estate [Member]
Restructuring Cost and Reserve [Line Items]
One-time termination benefits to employees		(3)
Cumulative restructuring charges		43
2010 Restructuring And Relocation Program [Member] | Rural Land Sales [Member]
Restructuring Cost and Reserve [Line Items]
One-time termination benefits to employees		12
Cumulative restructuring charges		793
2010 Restructuring And Relocation Program [Member] | Forestry [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring charges		193
2010 Restructuring And Relocation Program [Member] | Other [Member]
Restructuring Cost and Reserve [Line Items]
One-time termination benefits to employees	31	217
Cumulative restructuring charges		3,636
Remaining one-time termination benefits to employees - to be incurred during 2012	$ 8