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LONG-TERM INCENTIVE COMPENSATION (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense   $ 4,150 $ 3,746    
Award vesting rights, percentage 33.00%        
Trustee fee expense   500 400    
Fund III          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense   $ 2,500      
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)   319,242      
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) 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)   11,094      
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) 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   800   $ 1,900  
Compensation expense not yet recognized $ 8,200 8,200      
Long term incentive and share based compensation expense   $ 3,700 $ 3,500    
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) 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) 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) 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) 5,290