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
Jan. 23, 2020
Dec. 31, 2013
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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     $ 3.9 $ 4.2 $ 3.6    
Unvested compensation cost not yet recognized     $ 4.4        
Recognition period on unvested shares     3 years 2 months 12 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        
Total shares issued (in shares)             2,474,710
Granted (in shares)   1,683,560 28,894        
LTIP units | 2015 Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total shares issued (in shares)             996,562
LTIP units | LP Agreement              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total shares issued (in shares)             373,353
Granted (in shares) 28,894            
LTIP units | LP Agreement | Acquisition Consultants              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares issued for services (in shares)     28,892 5,714 174    
Shares issued for services (fair value)     $ 1.0 $ 0.2 $ 0.1    
Time-Based LTIP Unit              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Performance period     3 years        
Aggregate fair value of LTIP units vested during period     $ 3.1 $ 3.1 $ 2.1    
Granted (in shares)     111,898 101,167 100,176    
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     $ 0.4 $ 0.3 $ 0.3    
Restricted Common Shares | 2015 Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period (in years)           3 years 1 month 6 days  
Unvested compensation cost not yet recognized     $ 0.6        
Recognition period on unvested shares     3 years 1 month 6 days        
Restricted common shares granted (in shares)     21,861 18,218 12,311 94,215  
Aggregate fair value and total compensation cost of vested shares     $ 0.3 $ 0.3 $ 0.2    
Performance-Based LTIP Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Aggregate fair value of LTIP units vested during period     $ 1.1