SEGMENT REPORTING Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Real Estate at Cost	$ 1,819,053	$ 1,287,198	$ 897,370
Total Assets	2,244,523	1,670,163	1,077,694
Acquisition of Real Estate	220,041	241,894	116,408
Investment in Redevelopment and Improvements	106,883	82,127	61,311
Core Portfolio [Member]
Segment Reporting Information [Line Items]
Real Estate at Cost	1,059,257	722,345	475,685
Total Assets	1,012,553	727,423	487,469
Acquisition of Real Estate	143,616	175,556	56,103
Investment in Redevelopment and Improvements	10,611	3,862	12,266
Opportunity Funds [Member]
Segment Reporting Information [Line Items]
Real Estate at Cost	759,796	564,853	421,685
Total Assets	1,105,264	811,855	530,236
Acquisition of Real Estate	76,425	66,338	60,305
Investment in Redevelopment and Improvements	96,272	78,265	49,045
Notes Receivable [Member]
Segment Reporting Information [Line Items]
Real Estate at Cost	0	0	0
Total Assets	126,706	130,885	59,989
Acquisition of Real Estate	0	0	0
Investment in Redevelopment and Improvements	$ 0	$ 0	$ 0