Reportable Segments (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
REVENUES:
Net operating income	$ 86,296	$ 88,063	$ 83,220
Plus rental property operating expenses	55,918	53,750	57,996
Fee income	18,213	17,830	18,300
Reimbursed expenses	6,208	6,297	5,378
Residential lot, outparcel, and multi-family unit sales, net of cost of sales, including gain on sale of undepreciated investment properties	5,559	14,366	8,853
Less gain on sale of undepreciated investment properties not included in revenues	(3,258)	(1,697)	(1,243)
Plus residential lot, multi-family unit, tract, and outparcel cost of sales	5,378	37,716	30,652
Net operating income from discontinued operations not included in revenues	(6,641)	(11,291)	(12,972)
Other income	2,130	1,264	3,025
Other income - discontinued operations	(98)	(35)	(53)
Total consolidated revenues	178,464	215,556	203,284
Third party and joint venture [Member]
REVENUES:
Third party management and leasing expense reimbursements	$ 8,759	$ 9,293	$ 10,128