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LONG-TERM INCENTIVE COMPENSATION (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense     $ 5,669 $ 5,542  
Fund III          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense     $ 700    
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]          
Maximum percentage of promote to be awarded as share based compensation awards         20.00%
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)     247,863    
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)     8,640    
LTIP Units and Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense $ 500   $ 1,400    
Long term incentive and share based compensation expense $ 1,700 $ 1,600 5,200 $ 4,600  
Director          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Trustee fee expense     $ 200    
Director | 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)     10,601    
Director | 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)     14,179    
Director | Vesting at the end of year three | 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)     6,131    
Director | Vesting at the end of year three | 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)     6,469    
Director | Vesting ratably over last two years          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage     33.00%    
Share-based compensation arrangement by share-based payment award, award vesting period     3 years    
Director | Vesting ratably over last two years | 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)     4,470    
Director | Vesting ratably over last two years | 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)     7,710