Reportable Segments Reportable Segments Revenue Reconciliation Line items (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting Information [Line Items]
Net operating property income, including discontinued operations	$ 21,739	$ 21,375	$ 66,218	$ 64,627
Direct Costs of Leased and Rented Property or Equipment	14,400	11,775	39,595	33,658
Fee income, Net of Reimbursed Expenses	8,419	5,343	17,414	13,516
Third party management and leasing expense reimbursements	(2,311)	(3,300)	(8,397)	(7,536)
Reimbursed Expenses	1,235	1,866	3,968	4,749
Residential Lot Multi Family Unit Tract and Outparcel Sales Net of Cost of Sales Including Gain on Sale of Undepreciated Investment Properties	378	7	882	2,284
Plus residential lot, multi-family unit and outparcel cost of sales	354	158	1,334	2,790
Net operating income from discontinued operations not included in revenues	(3,547)	(6,128)	(12,967)	(19,483)
Other Income	3,328	448	5,059	1,605
Discontinued Operations Other Income	(267)	(1)	(472)	(115)
Total consolidated revenues	$ 43,728	$ 31,543	$ 112,634	$ 96,095