Notes And Other Receivables , Narrative (Details) (USD $)						3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2012 Collateralized receivables, net and Installment Notes Receivables on Manufactured Homes [Member]	Dec. 31, 2011 Collateralized receivables, net and Installment Notes Receivables on Manufactured Homes [Member]	Dec. 31, 2010 Collateralized receivables, net and Installment Notes Receivables on Manufactured Homes [Member]	Mar. 31, 2012 Installment notes receivable on manufactured homes, net [Member]	Dec. 31, 2011 Installment notes receivable on manufactured homes, net [Member]	Mar. 31, 2012 Collateralized receivables [Member]	Dec. 31, 2011 Collateralized receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes and other receivables	$ 112,932,000	$ 114,884,000				$ 14,191,000	$ 13,417,000	$ 83,098,000	$ 81,176,000
Loans and Leases Receivable, Allowance			623,000	635,000	303,000	100,000	100,000	500,000	500,000
Receivable with imputed interest, rate						8.10%	7.90%
Receivable With Imputed Interest, Term						10 years 5 months	10 years 4 months	13 years 1 month	13 years 3 months
Other receivables for rent, water, sewer usage	2,600,000	3,000,000
Allowance for rent, water, sewer usage receivables	300,000	400,000
Home sale proceeds	3,800,000	3,300,000
Insurance receivables	800,000	800,000
Rebates receivable in association of FNMA settlement		4,900,000
Insurance Settlements Receivable	3,700,000	3,700,000
Note receivable related to Kentland acquistion	900,000	900,000
Other receivables	$ 3,800,000	$ 3,700,000