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, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Number of Restricted Common Shares        
Outstanding at beginning of year (in shares) 25,779 22,589 21,585  
Granted (in shares) 21,861 18,218 12,311 94,215
Vested (in shares) (12,471) (10,734) (8,041)  
Forfeited (in shares) (5,240) (4,294) (3,266)  
Unvested at end of year (in shares) 29,929 25,779 22,589 25,779
Weighted Average Grant-Date Fair Value        
Outstanding at beginning of year (in dollars per share) $ 26.26 $ 24.83 $ 22.43  
Granted (in dollars per share) 36.19 26.46 27.26  
Vested (in dollars per share) 25.85 23.54 21.88  
Forfeited (in dollars per share) 32.00 25.61 25.35  
Unvested at end of year (in dollars per share) $ 32.68 $ 26.26 $ 24.83 $ 26.26