Annual report pursuant to Section 13 and 15(d)

EQUITY-BASED AWARDS - Restricted Common Shares (Details)

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EQUITY-BASED AWARDS - Restricted Common Shares (Details) - Restricted Common Shares - 2015 Plan - $ / shares
 12 Months Ended 60 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Number of Restricted Common Shares        
Outstanding at beginning of year (in shares) 22,589 21,585 13,590  
Granted (in shares) 18,218 12,311 16,525 72,354
Vested (in shares) (10,734) (8,041) (8,530)  
Forfeited (in shares) (4,294) (3,266) 0  
Unvested at end of year (in shares) 25,779 22,589 21,585 25,779
Weighted Average Grant-Date Fair Value        
Outstanding at beginning of year (in dollars per share) $ 24.83 $ 22.43 $ 12.40  
Granted (in dollars per share) 26.46 27.26 24.04  
Vested (in dollars per share) 23.54 21.88 14.11  
Forfeited (in dollars per share) 25.61 25.35 0  
Unvested at end of year (in dollars per share) $ 26.26 $ 24.83 $ 22.43 $ 26.26