Restructuring (Charges Associated With The Relocation And Restructuring Programs By Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended													63 Months Ended	12 Months Ended			63 Months Ended	12 Months Ended			63 Months Ended	12 Months Ended			63 Months Ended	12 Months Ended		63 Months Ended	12 Months Ended				63 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 2011 Restructuring Program [Member]	Dec. 31, 2011 2011 Restructuring Program [Member] Residential Real Estate [Member]	Dec. 31, 2011 2011 Restructuring Program [Member] Commercial Real Estate [Member]	Dec. 31, 2011 2011 Restructuring Program [Member] Rural Land Sales [Member]	Dec. 31, 2011 2011 Restructuring Program [Member] Forestry [Member]	Dec. 31, 2011 2011 Restructuring Program [Member] Other [Member]	Dec. 31, 2011 2010 Restructuring And Relocation Program And 2009 Restructuring Plan [Member]		Dec. 31, 2010 2010 Restructuring And Relocation Program And 2009 Restructuring Plan [Member]	Dec. 31, 2009 2010 Restructuring And Relocation Program And 2009 Restructuring Plan [Member]	Dec. 31, 2011 2010 Restructuring And Relocation Program And 2009 Restructuring Plan [Member]	Dec. 31, 2011 2010 Restructuring And Relocation Program And 2009 Restructuring Plan [Member] Residential Real Estate [Member]	Dec. 31, 2010 2010 Restructuring And Relocation Program And 2009 Restructuring Plan [Member] Residential Real Estate [Member]	Dec. 31, 2009 2010 Restructuring And Relocation Program And 2009 Restructuring Plan [Member] Residential Real Estate [Member]	Dec. 31, 2011 2010 Restructuring And Relocation Program And 2009 Restructuring Plan [Member] Residential Real Estate [Member]	Dec. 31, 2011 2010 Restructuring And Relocation Program And 2009 Restructuring Plan [Member] Commercial Real Estate [Member]	Dec. 31, 2010 2010 Restructuring And Relocation Program And 2009 Restructuring Plan [Member] Commercial Real Estate [Member]	Dec. 31, 2009 2010 Restructuring And Relocation Program And 2009 Restructuring Plan [Member] Commercial Real Estate [Member]	Dec. 31, 2011 2010 Restructuring And Relocation Program And 2009 Restructuring Plan [Member] Commercial Real Estate [Member]	Dec. 31, 2011 2010 Restructuring And Relocation Program And 2009 Restructuring Plan [Member] Rural Land Sales [Member]	Dec. 31, 2010 2010 Restructuring And Relocation Program And 2009 Restructuring Plan [Member] Rural Land Sales [Member]	Dec. 31, 2009 2010 Restructuring And Relocation Program And 2009 Restructuring Plan [Member] Rural Land Sales [Member]	Dec. 31, 2011 2010 Restructuring And Relocation Program And 2009 Restructuring Plan [Member] Rural Land Sales [Member]	Dec. 31, 2010 2010 Restructuring And Relocation Program And 2009 Restructuring Plan [Member] Forestry [Member]	Dec. 31, 2009 2010 Restructuring And Relocation Program And 2009 Restructuring Plan [Member] Forestry [Member]	Dec. 31, 2011 2010 Restructuring And Relocation Program And 2009 Restructuring Plan [Member] Forestry [Member]	Dec. 31, 2011 2010 Restructuring And Relocation Program And 2009 Restructuring Plan [Member] Other [Member]		Dec. 31, 2010 2010 Restructuring And Relocation Program And 2009 Restructuring Plan [Member] Other [Member]	Dec. 31, 2009 2010 Restructuring And Relocation Program And 2009 Restructuring Plan [Member] Other [Member]	Dec. 31, 2011 2010 Restructuring And Relocation Program And 2009 Restructuring Plan [Member] Other [Member]
Restructuring Cost and Reserve [Line Items]
One-time termination benefits to employees	$ 797	$ 348	$ 5,926	$ 4,476	$ 899	$ 1,654	$ 1,158	$ 1,540	$ 11,547	$ 5,251	$ 5,368	$ 10,931	$ 623	$ 1,659	$ 208	$ 77	$ 8,364	$ 616		$ 5,251	$ 5,368		$ 73	$ 961	$ 871		$ (3)	$ 46	$ 648		$ (12)	$ 781	$ 124		$ 193	$ 1		$ 558		$ 3,270	$ 3,724
Cumulative restructuring charges												10,931	623	1,659	208	77	8,364					37,784				19,553				1,344				2,554			494					13,839
Remaining one-time termination benefits to employees																		$ 461	[1]																			$ 461	[1]

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