Reportable Segments Reportable Segments (Revenue Reconciliation) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Document Fiscal Year Focus			2014
Rental property operating expenses	$ (38,685)	$ (22,035)	$ (109,501)	$ (55,112)
Total consolidated revenues	89,098	50,434	255,326	131,219
Total Segment [Member]
Segment Reporting Information [Line Items]
Net operating property income, including discontinued operations	55,112	34,832	156,419	89,574
Residential Lot Sales Net of Cost of Sales Including Gain on Sale of Undepreciated Investment Properties	82	719	1,615	1,398
Fee income, Net of Reimbursed Expenses	1,802	2,420	6,165	9,007
Other Income	399	303	4,563	2,649
Rental property operating expenses	38,685	22,035	109,501	(55,112)
Plus residential lot, multi-family unit and outparcel cost of sales	55	147	325	(1,725)
Net operating income in joint venture	(6,601)	(7,538)	(19,748)	(21,567)
Net sales of joint ventures	0	(109)	(47)	(111)
Net operating income from discontinued operations not included in revenues	(341)	(1,752)	(1,798)	(5,318)
Fee income in discontinued operation	0	0	0	(76)
Discontinued Operations Other Income	14	18	29	33
Termination Fees in Discontinues Operations and in Joint Ventures	0	0	(74)	(19)
Residential Lot Multi Family Unit Tract and Outparcel Sales Net of Cost of Sales Including Gain on Sale of Undepreciated Investment Properties	(81)	(605)	(1,566)	(1,122)
Total consolidated revenues	$ 89,098	$ 50,434	$ 255,326	$ 131,219