NONCONTROLLING INTERESTS (Tables)
 12 Months Ended
Dec. 31, 2015
Noncontrolling Interest [Abstract]  
Schedule of outstanding equity interests
As of December 31, 2015 and 2014, units reflecting noncontrolling interests consisted of the following:
 
December 31,
 
2015
 
2014
OP units
21,556,006

 
18,817,088

Subordinated performance units
9,302,989

 
8,447,679

LTIP units
2,784,761

 
2,689,780

DownREIT units
 
 
 
DownREIT OP units
1,834,786

 
1,275,979

DownREIT subordinated performance units
4,386,999

 
3,009,884

Total
39,865,541

 
34,240,410