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SEGMENT REPORTING Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Real estate at cost $ 2,736,283 $ 2,208,595 $ 1,819,053
Total assets 3,032,319 2,720,721 2,244,523
Acquisition of real estate 344,476 250,353 220,041
Redevelopment and property improvement costs 164,315 140,118 106,883
Core Portfolio [Member]      
Segment Reporting Information [Line Items]      
Real estate at cost 1,572,681 1,366,017 1,059,257
Total assets 1,662,092 1,613,290 1,012,553
Acquisition of real estate 188,835 203,103 143,616
Redevelopment and property improvement costs 16,505 5,432 10,611
Funds [Member]      
Segment Reporting Information [Line Items]      
Real estate at cost 1,163,602 842,578 759,796
Total assets 1,223,039 1,005,145 1,105,264
Acquisition of real estate 155,641 47,250 76,425
Redevelopment and property improvement costs 147,810 134,686 96,272
Structuring Financing [Member]      
Segment Reporting Information [Line Items]      
Real estate at cost 0 0 0
Total assets 147,188 102,286 126,706
Acquisition of real estate 0 0 0
Redevelopment and property improvement costs $ 0 $ 0 $ 0