Discontinued Operations (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Discontinued Operations [Abstract]
Sale of Woodlawn Colonial, a 159-unit community in Chula Vista, California	$ 16,000,000		$ 16,000,000
Rental revenues	134,000	450,000	595,000	884,000
Property operating expenses	(48,000)	(180,000)	(228,000)	(362,000)
Depreciation and amortization	0	(105,000)	(115,000)	(209,000)
Income from real estate sold	86,000	165,000	252,000	313,000
Gain on sale	5,854,000	0	5,854,000	0
Internal disposition costs	(589,000)	0	(589,000)	0
Gain on sale less internal disposition costs		0	5,265,000
Income from discontinued operations	5,351,000	165,000	5,517,000	313,000
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of Woodlawn Colonial, net of internal disposition costs	5,854,000	0	5,854,000	0
Woodlawn Colonial [Member]
Discontinued Operations [Abstract]
Gain on sale	5,300,000
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of Woodlawn Colonial, net of internal disposition costs	$ 5,300,000