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, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2019
Number of Restricted Common Shares        
Outstanding at beginning of year (in shares) 29,929 25,779 22,589  
Granted (in shares) 29,248 21,861 18,218 123,463
Vested (in shares) (12,763) (12,471) (10,734)  
Forfeited (in shares) (15,755) (5,240) (4,294)  
Unvested at end of year (in shares) 30,659 29,929 25,779 25,779
Weighted Average Grant-Date Fair Value        
Outstanding at beginning of year (in dollars per share) $ 32.68 $ 26.26 $ 24.83  
Granted (in dollars per share) 43.80 36.19 26.46  
Vested (in dollars per share) 31.14 25.85 23.54  
Forfeited (in dollars per share) 39.52 32.00 25.61  
Unvested at end of year (in dollars per share) $ 40.41 $ 32.68 $ 26.26 $ 26.26