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LONG-TERM INCENTIVE COMPENSATION (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 4,019 $ 1,889    
Fund III        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 1,500      
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) 289,925      
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      
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 $ 10,400      
Share-based compensation expense 500   $ 1,900  
Compensation expense not yet recognized 8,500      
Long term incentive and share based compensation expense 1,900 1,800    
Director        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Trustee fee expense $ 200 $ 200