SEGMENT REPORTING (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 segment	Sep. 30, 2013
Segment Reporting Information [Line Items]
Number of reportable segments			3
Revenues	$ 47,660	$ 41,086	$ 143,856	$ 124,183
Property operating expenses, other operating and real estate taxes	(12,424)	(12,176)	(38,119)	(33,205)
General and administrative expenses	(7,123)	(5,335)	(20,898)	(17,263)
Depreciation and amortization	(12,884)	(10,450)	(36,055)	(29,278)
Operating income	15,229	13,125	48,784	44,437
Equity in (losses) earnings of unconsolidated affiliates	2,923	4,209	7,382	7,274
Gain on disposition of properties of unconsolidated affiliates	102,855	0	102,855	0
Impairment of asset	0	0	0	(1,500)
Loss on debt extinguishment	0	0	(269)	0
Gain on disposition of property	190	0	13,138	0
Interest and other finance expense	(10,142)	(10,595)	(30,327)	(29,806)
Income tax benefit (provision)	17	(186)	(68)	(57)
Income from continuing operations	111,072	6,553	141,495	20,348
Operating income from discontinued operations	0	2,589	0	5,394
Gain on disposition of property	0	0	560	4,191
Net income	111,072	9,142	142,055	29,933
Income from continuing operations	(82,508)	2,342	(79,971)	6,103
Income from discontinued operations	0	(1,999)	(461)	(8,171)
Net (income) loss attributable to noncontrolling interests	(82,508)	343	(80,432)	(2,068)
Net income attributable to Common Shareholders	28,564	9,485	61,623	27,865
Real Estate at Cost	2,115,724	1,675,117	2,115,724	1,675,117
Total Assets	2,454,651	2,349,368	2,454,651	2,349,368
Acquisition of Real Estate	29,378	30,975	136,978	140,075
Investment in Redevelopment and Improvements	36,736	35,982	105,049	79,549
Core Portfolio
Segment Reporting Information [Line Items]
Revenues	31,291	28,115	91,974	82,252
Property operating expenses, other operating and real estate taxes	(8,198)	(7,723)	(23,693)	(21,098)
General and administrative expenses	(5,828)	(4,954)	(18,191)	(16,042)
Depreciation and amortization	(9,330)	(7,890)	(25,963)	(21,187)
Operating income	7,935	7,548	24,127	23,925
Equity in (losses) earnings of unconsolidated affiliates	118	(49)	441	(96)
Gain on disposition of properties of unconsolidated affiliates	0		0
Impairment of asset				(1,500)
Loss on debt extinguishment			0
Gain on disposition of property	190		12,577
Interest and other finance expense	(7,274)	(6,683)	(21,436)	(19,169)
Income tax benefit (provision)	(71)	(81)	(84)	159
Income from continuing operations		735	15,625	3,319
Operating income from discontinued operations		171		384
Gain on disposition of property			0	0
Net income	898	906	15,625	3,703
Income from continuing operations		0	(2,834)	0
Income from discontinued operations		(68)	0	(154)
Net (income) loss attributable to noncontrolling interests	(1,465)	(68)	(2,834)	(154)
Net income attributable to Common Shareholders	(567)	838	12,791	3,549
Real Estate at Cost	1,280,087	998,711	1,280,087	998,711
Total Assets	1,289,107	993,472	1,289,107	993,472
Acquisition of Real Estate	29,378	11,800	136,978	120,900
Investment in Redevelopment and Improvements	650	5,246	3,711	8,957
Funds
Segment Reporting Information [Line Items]
Revenues	13,363	10,002	39,938	32,666
Property operating expenses, other operating and real estate taxes	(4,226)	(4,453)	(14,426)	(12,107)
General and administrative expenses	(1,054)	(381)	(2,179)	(1,221)
Depreciation and amortization	(3,554)	(2,560)	(10,092)	(8,091)
Operating income	4,529	2,608	13,241	11,247
Equity in (losses) earnings of unconsolidated affiliates	2,805	4,258	6,941	7,370
Gain on disposition of properties of unconsolidated affiliates	102,855		102,855
Impairment of asset				0
Loss on debt extinguishment			(269)
Gain on disposition of property	0		561
Interest and other finance expense	(2,868)	(3,912)	(8,891)	(10,637)
Income tax benefit (provision)	88	(105)	16	(216)
Income from continuing operations		2,849	114,454	7,764
Operating income from discontinued operations		2,418		5,010
Gain on disposition of property			560	4,191
Net income	107,409	5,267	115,014	16,965
Income from continuing operations		2,342	(77,137)	6,103
Income from discontinued operations		(1,931)	(461)	(8,017)
Net (income) loss attributable to noncontrolling interests	(81,043)	411	(77,598)	(1,914)
Net income attributable to Common Shareholders	26,366	5,678	37,416	15,051
Real Estate at Cost	835,637	676,406	835,637	676,406
Total Assets	1,071,135	1,260,544	1,071,135	1,260,544
Acquisition of Real Estate	0	19,175	0	19,175
Investment in Redevelopment and Improvements	36,086	30,736	101,338	70,592
Structured Financing
Segment Reporting Information [Line Items]
Revenues	3,006	2,969	11,944	9,265
Property operating expenses, other operating and real estate taxes	0	0	0	0
General and administrative expenses	(241)	0	(528)	0
Depreciation and amortization	0	0	0	0
Operating income	2,765	2,969	11,416	9,265
Equity in (losses) earnings of unconsolidated affiliates	0	0	0	0
Gain on disposition of properties of unconsolidated affiliates	0		0
Impairment of asset				0
Loss on debt extinguishment			0
Gain on disposition of property	0		0
Interest and other finance expense	0	0	0	0
Income tax benefit (provision)	0	0	0	0
Income from continuing operations		2,969	11,416	9,265
Operating income from discontinued operations		0		0
Gain on disposition of property			0	0
Net income	2,765	2,969	11,416	9,265
Income from continuing operations		0	0	0
Income from discontinued operations		0	0	0
Net (income) loss attributable to noncontrolling interests	0	0	0	0
Net income attributable to Common Shareholders	2,765	2,969	11,416	9,265
Real Estate at Cost	0	0	0	0
Total Assets	94,409	95,352	94,409	95,352
Acquisition of Real Estate	0	0	0	0
Investment in Redevelopment and Improvements	$ 0	$ 0	$ 0	$ 0