Commitments And Contingencies (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	May 12, 2010 plaintiffs properties	Nov. 07, 2008 properties plaintiffs	Oct. 24, 2008 plaintiffs properties	May 16, 2008 plaintiffs properties
Loss Contingencies [Line Items]
Mortgage loan loss reserve	$ 8,011,000		$ 7,464,000
Mortgage loan loss payments	(14,450,000)	(2,760,000)	(1,164,000)
Outstanding performance bonds	63,200,000
Letters of credit outstanding	20,600,000
Number of plaintiffs				40	35	86	66
Number of households				11	9	21	15
Legal accruals	9,400,000	14,200,000
Interest rate lock	3.90%
Non-cancelable operating leases	7,700,000	8,700,000	9,800,000
HomeAmerican [Member]
Loss Contingencies [Line Items]
Letters of credit outstanding	6,900,000
Performance Guarantee [Member]
Loss Contingencies [Line Items]
Mortgage loan loss reserve	$ 22,900,000