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LONG-TERM INCENTIVE COMPENSATION (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
executive
shares
Sep. 30, 2016
USD ($)
shares
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense   $ 9,729 $ 5,669    
Number of executives retired during period | executive 2        
Award vesting rights, percentage 33.00%        
Trustee fee expense   800 700    
Fund III          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense   $ 3,600      
Senior Executives | Long Term Investment Alignment Program          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum percentage of promote to be awarded as share based compensation awards         25.00%
Senior Executives | Long Term Investment Alignment Program | Fund IV          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of promote awarded as share based compensation award         9.30%
Senior Executives | Long Term Investment Alignment Program | Fund III          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of promote awarded as share based compensation award         25.00%
LTIP Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock issued during period, shares, share-based compensation, net of forfeitures (in shares) | shares 29,418 319,244      
Total value of restricted shares and LTIP units as of the grant date $ 1,100        
Share-based compensation expense $ 1,800        
LTIP Units | Board of Trustees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based payment award, grants in period (in shares) | shares 13,491        
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock issued during period, shares, share-based compensation, net of forfeitures (in shares) | shares   11,092      
Restricted Stock | Board of Trustees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based payment award, grants in period (in shares) | shares 10,822        
LTIP Units and Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total value of restricted shares and LTIP units as of the grant date   $ 10,100      
Share-based compensation expense   1,800   $ 1,900  
Compensation expense not yet recognized $ 8,200 8,200      
Long term incentive and share based compensation expense   $ 9,100 $ 5,200    
Tranche One | LTIP Units | Board of Trustees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation, vested in period (in shares) | shares 4,674        
Tranche One | Restricted Stock | Board of Trustees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation, vested in period (in shares) | shares 5,532        
Tranche Two | LTIP Units | Board of Trustees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation, vested in period (in shares) | shares 8,817        
Tranche Two | Restricted Stock | Board of Trustees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation, vested in period (in shares) | shares 5,290