Reportable Segments (Revenue Reconciliation) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Direct Costs of Leased and Rented Property or Equipment	$ (18,576)	$ (12,521)	$ (34,406)	$ (24,370)
Total consolidated revenues	44,158	32,496	84,052	65,873
Total Segment [Member]
Segment Reporting Information [Line Items]
Net operating property income, including discontinued operations	28,574	27,428	54,744	56,685
Residential Lot Sales Net of Cost of Sales Including Gain on Sale of Undepreciated Investment Properties	268	143	679	526
Fee income, Net of Reimbursed Expenses	2,934	8,815	6,588	16,382
Other Income	2,064	112	2,346	1,619
Direct Costs of Leased and Rented Property or Equipment	18,576	12,521	34,406	24,370
Plus residential lot, multi-family unit and outparcel cost of sales	434	535	1,579	1,100
Net operating income in joint venture	(7,582)	(5,937)	(14,030)	(12,206)
Net sales of joint ventures	8	2	(2)	4
Net operating income from discontinued operations not included in revenues	(839)	(5,093)	(1,644)	(11,632)
Fee income in discontinued operation	(3)	(6,029)	(77)	(10,740)
Discontinued Operations Other Income	0	31	19	265
Residential Lot Multi Family Unit Tract and Outparcel Sales Net of Cost of Sales Including Gain on Sale of Undepreciated Investment Properties	(276)	30	(518)	30
Total consolidated revenues	$ 44,158	$ 32,496	$ 84,052	$ 65,873