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 108 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2023
Number of Restricted Common Shares        
Outstanding at beginning of year (in shares) 25,435 30,659 29,929  
Granted (in shares) 12,856 10,405 29,248 146,724
Vested (in shares) (12,011) (10,208) (12,763)  
Forfeited (in shares) (4,878) (5,421) (15,755)  
Unvested at end of year (in shares) 21,402 25,435 30,659 21,402
Weighted Average Grant-Date Fair Value        
Outstanding at beginning of year (in dollars per share) $ 48.90 $ 40.41 $ 32.68  
Granted (in dollars per share) 42.46 57.97 43.80  
Vested (in dollars per share) 45.44 34.83 31.14  
Forfeited (in dollars per share) 47.41 45.21 39.52  
Unvested at end of year (in dollars per share) $ 46.65 $ 48.90 $ 40.41 $ 46.65