SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) segment	Jun. 30, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			3
Revenues	$ 51,333	$ 53,161	$ 104,016	$ 105,642
Property operating expenses, other operating and real estate taxes	(11,283)	(13,214)	(23,276)	(29,357)
General and administrative expenses	(8,521)	(8,005)	(17,873)	(15,537)
Depreciation and amortization	(14,678)	(13,903)	(31,527)	(27,561)
Impairment of asset	0	(5,000)	0	(5,000)
Operating income	16,851	13,039	31,340	28,187
Equity in earnings of unconsolidated affiliates	1,740	3,406	3,694	9,999
Gain on disposition of property of unconsolidated affiliates	0	17,105	0	17,105
Loss on debt extinguishment	(15)	(25)	(15)	(134)
Gain on disposition of properties	16,572	61,841	81,965	88,984
Interest and other finance expense	(8,882)	(9,964)	(16,920)	(18,785)
Income tax (provision) benefit	(111)	56	(34)	(1,361)
Net income	26,155	85,458	100,030	123,995
Net income attributable to noncontrolling interests	(8,237)	(58,963)	(53,187)	(80,953)
Net income attributable to Common Shareholders	17,918	26,495	46,843	43,042
Real Estate at Cost	2,647,745	2,578,580	2,647,745	2,578,580
Total Assets	3,235,040	2,973,699	3,235,040	2,973,699
Acquisition of Real Estate	6,250	52,800	18,537	273,071
Investment in Redevelopment and Improvements	18,427	64,751	55,890	105,245
Core Portfolio
Segment Reporting Information [Line Items]
Revenues	34,693	37,593	72,800	73,186
Property operating expenses, other operating and real estate taxes	(8,286)	(8,235)	(16,848)	(17,926)
General and administrative expenses	(7,967)	(7,397)	(17,040)	(14,208)
Depreciation and amortization	(11,706)	(10,568)	(25,201)	(20,475)
Impairment of asset		(5,000)		(5,000)
Operating income	6,734	6,393	13,711	15,577
Equity in earnings of unconsolidated affiliates	581	699	1,173	1,133
Gain on disposition of property of unconsolidated affiliates		0		0
Loss on debt extinguishment	0	0	0	0
Gain on disposition of properties	0	0	0	0
Interest and other finance expense	(7,113)	(7,329)	(13,877)	(13,797)
Income tax (provision) benefit	(87)	75	(10)	(405)
Net income	115	(162)	997	2,508
Net income attributable to noncontrolling interests	(9)	2,205	(2,831)	2,026
Net income attributable to Common Shareholders	106	2,043	(1,834)	4,534
Real Estate at Cost	1,528,848	1,553,174	1,528,848	1,553,174
Total Assets	1,809,395	1,650,555	1,809,395	1,650,555
Acquisition of Real Estate	6,250	0	6,250	169,235
Investment in Redevelopment and Improvements	6,975	3,271	10,222	9,624
Funds
Segment Reporting Information [Line Items]
Revenues	9,225	11,583	19,163	25,063
Property operating expenses, other operating and real estate taxes	(2,997)	(4,979)	(6,428)	(11,431)
General and administrative expenses	(554)	(608)	(833)	(1,329)
Depreciation and amortization	(2,972)	(3,335)	(6,326)	(7,086)
Impairment of asset		0		0
Operating income	2,702	2,661	5,576	5,217
Equity in earnings of unconsolidated affiliates	1,159	2,707	2,521	8,866
Gain on disposition of property of unconsolidated affiliates		17,105		17,105
Loss on debt extinguishment	(15)	(25)	(15)	(134)
Gain on disposition of properties	16,572	61,841	81,965	88,984
Interest and other finance expense	(1,769)	(2,635)	(3,043)	(4,988)
Income tax (provision) benefit	(24)	(19)	(24)	(956)
Net income	18,625	81,635	86,980	114,094
Net income attributable to noncontrolling interests	(8,228)	(61,168)	(50,356)	(82,979)
Net income attributable to Common Shareholders	10,397	20,467	36,624	31,115
Real Estate at Cost	1,118,897	1,025,406	1,118,897	1,025,406
Total Assets	1,152,103	1,154,213	1,152,103	1,154,213
Acquisition of Real Estate	0	52,800	12,287	103,836
Investment in Redevelopment and Improvements	11,452	61,480	45,668	95,621
Structured Financing Portfolio
Segment Reporting Information [Line Items]
Revenues	7,415	3,985	12,053	7,393
Property operating expenses, other operating and real estate taxes	0	0	0	0
General and administrative expenses	0	0	0	0
Depreciation and amortization	0	0	0	0
Impairment of asset		0		0
Operating income	7,415	3,985	12,053	7,393
Equity in earnings of unconsolidated affiliates	0	0	0	0
Gain on disposition of property of unconsolidated affiliates		0		0
Loss on debt extinguishment	0	0	0	0
Gain on disposition of properties	0	0	0	0
Interest and other finance expense	0	0	0	0
Income tax (provision) benefit	0	0	0	0
Net income	7,415	3,985	12,053	7,393
Net income attributable to noncontrolling interests	0	0	0	0
Net income attributable to Common Shareholders	7,415	3,985	12,053	7,393
Real Estate at Cost	0	0	0	0
Total Assets	273,542	168,931	273,542	168,931
Acquisition of Real Estate	0	0	0	0
Investment in Redevelopment and Improvements	$ 0	$ 0	$ 0	$ 0