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LONG-TERM INCENTIVE COMPENSATION (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense     $ 3,746 $ 3,833  
Trustee fee expense $ 0        
Fund III          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense $ 700        
Officer          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation arrangement by share-based payment award, award vesting period 5 years        
Other Officers          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation arrangement by share-based payment award, award vesting period 3 years        
Other Employees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation arrangement by share-based payment award, award vesting period 3 years        
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) 6,986   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) 14,179   8,640    
LTIP Units and Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense $ 400   $ 900    
Long term incentive and share based compensation expense $ 1,700 $ 1,600 $ 3,500 $ 3,000  
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) 4,416        
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        
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        
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) 2,570        
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