Significant Transactions (Details Textual 1) (USD $)	12 Months Ended
	Dec. 31, 2013 Property	Dec. 31, 2012	Dec. 31, 2011
Schedule of Asset Managed Portoflio Sale Amounts [Line Items]
Gain on dispositions of unconsolidated real estate and other, net	$ 1,797,000	$ 21,886,000	$ 2,403,000
Number of partnerships in legally sold portfolio	17
Number of consolidated communities in legally sold portfolio	14
Number of unconsolidated communities in legally sold portfolio	61
Noncontrolling Interest in Limited Partnerships share of net income for dercognition	20,600,000
Parent Company [Member]
Schedule of Asset Managed Portoflio Sale Amounts [Line Items]
Gain on dispositions of unconsolidated real estate and other, net		$ 15,700,000