Annual report pursuant to Section 13 and 15(d)

EQUITY-BASED AWARDS - Narrative (Details)

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EQUITY-BASED AWARDS - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended 60 Months Ended 84 Months Ended
Dec. 31, 2013
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2019
2015 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percent of shares outstanding issuable   5.00%        
LTIP units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total compensation cost recognized   $ 4.2 $ 3.6 $ 3.5    
Unvested compensation cost not yet recognized   $ 3.7     $ 3.7 $ 3.7
Recognition period on unvested shares   2 years 4 months 24 days        
LTIP units | 2013 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum number of shares authorized under under plan (in shares)   2,500,000     2,500,000 2,500,000
Total shares issued (in shares)           2,474,710
LTIP units | 2015 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total shares issued (in shares)           776,997
LTIP units | LP Agreement            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total shares issued (in shares)           315,567
Time-Based LTIP Unit            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate fair value of LTIP units vested during period   $ 3.1 $ 2.1 $ 2.6    
Granted (in shares)   101,167 100,176 128,051    
Time-Based LTIP Unit | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period (in years)   1 year        
Time-Based LTIP Unit | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period (in years)   3 years        
Restricted Common Shares            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total compensation cost recognized   $ 0.3 $ 0.3 $ 0.2    
Restricted Common Shares | 2015 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period (in years)         3 years  
Unvested compensation cost not yet recognized   $ 0.4     $ 0.4 $ 0.4
Recognition period on unvested shares   2 years        
Restricted common shares granted (in shares)   18,218 12,311 16,525 72,354  
Aggregate fair value and total compensation cost of vested shares   $ 0.3 $ 0.2 $ 0.1    
PRO | Management | LTIP units | 2013 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate fair value of LTIP units vested during period       $ 0.9    
Granted (in shares) 1,683,560          
Acquisition Consultants | LTIP units | LP Agreement            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares issued for services (in shares)   5,714 174 776    
Shares issued for services (fair value)   $ 0.2 $ 0.1 $ 0.1