SEGMENT REPORTING (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 reportable_segments	Mar. 31, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Number of reportable segments	3
Revenues	$ 46,685	$ 42,289
Property operating expenses, other operating and real estate taxes	(13,481)	(10,983)
General and administrative	(6,896)	(5,626)
Depreciation and amortization	(11,587)	(9,229)
Operating income	14,721	16,451
Equity in (losses) earnings of unconsolidated affiliates	3,029	2,250
Loss on debt extinguishment	(203)	0
Gain on disposition of property	12,387	0
Interest and other finance expense	(10,651)	(9,285)
Income tax provision	(168)	139
Income from continuing operations	19,115	9,555
Income from discontinued operations	0	1,624
Net income	19,115	11,179
Continuing operations	2,480	35
Income from discontinued operations attributable to noncontrolling interests	0	(1,591)
Net income attributable to noncontrolling interests	2,480	(1,556)
Net income attributable to Common Shareholders	21,595	9,623
Real Estate at Cost	1,922,910		1,543,290
Total Assets	2,345,862		2,295,869
Acquisition of Real Estate	90,500		86,600
Investment in Redevelopment and Improvements	37,505		17,941
Core Portfolio
Segment Reporting Information [Line Items]
Revenues	30,149	26,478
Property operating expenses, other operating and real estate taxes	(7,906)	(6,873)
General and administrative	(6,413)	(5,481)
Depreciation and amortization	(8,333)	(6,389)
Operating income	7,497	7,735
Equity in (losses) earnings of unconsolidated affiliates	95	(5)
Loss on debt extinguishment	0
Gain on disposition of property	12,387
Interest and other finance expense	(7,200)	(6,157)
Income tax provision	(104)	92
Income from continuing operations	12,675	1,665
Income from discontinued operations		101
Net income		1,766
Continuing operations	(419)	304
Income from discontinued operations attributable to noncontrolling interests		(40)
Net income attributable to noncontrolling interests		264
Net income attributable to Common Shareholders	12,256	2,030
Real Estate at Cost	1,128,790		956,647
Total Assets	1,101,385		1,075,253
Acquisition of Real Estate	90,500		86,600
Investment in Redevelopment and Improvements	1,428		456
Opportunity Funds
Segment Reporting Information [Line Items]
Revenues	12,642	12,913
Property operating expenses, other operating and real estate taxes	(5,575)	(4,110)
General and administrative	(483)	(145)
Depreciation and amortization	(3,254)	(2,840)
Operating income	3,330	5,818
Equity in (losses) earnings of unconsolidated affiliates	2,934	2,255
Loss on debt extinguishment	(203)
Gain on disposition of property	0
Interest and other finance expense	(3,451)	(3,128)
Income tax provision	(64)	47
Income from continuing operations	2,546	4,992
Income from discontinued operations		1,523
Net income		6,515
Continuing operations	2,899	(269)
Income from discontinued operations attributable to noncontrolling interests		(1,551)
Net income attributable to noncontrolling interests		(1,820)
Net income attributable to Common Shareholders	5,445	4,695
Real Estate at Cost	794,120		586,643
Total Assets	1,124,838		1,115,249
Acquisition of Real Estate	0		0
Investment in Redevelopment and Improvements	36,077		17,485
Structured Financing
Segment Reporting Information [Line Items]
Revenues	3,894	2,898
Property operating expenses, other operating and real estate taxes	0	0
General and administrative	0	0
Depreciation and amortization	0	0
Operating income	3,894	2,898
Equity in (losses) earnings of unconsolidated affiliates	0	0
Loss on debt extinguishment	0
Gain on disposition of property	0
Interest and other finance expense	0	0
Income tax provision	0	0
Income from continuing operations	3,894	2,898
Income from discontinued operations		0
Net income		2,898
Continuing operations	0	0
Income from discontinued operations attributable to noncontrolling interests		0
Net income attributable to noncontrolling interests		0
Net income attributable to Common Shareholders	3,894	2,898
Real Estate at Cost	0		0
Total Assets	119,639		105,367
Acquisition of Real Estate	0		0
Investment in Redevelopment and Improvements	$ 0		$ 0