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 [Member] - 2015 Plan [Member] - $ / shares
12 Months Ended 48 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Number of Restricted Common Shares        
Outstanding at beginning of year (in shares) 21,585 13,590 11,000  
Granted (in shares) 12,311 16,525 8,090 54,136
Vested (in shares) (8,041) (8,530) (5,500)  
Forfeited (in shares) (3,266) 0 0  
Unvested at end of year (in shares) 22,589 21,585 13,590 22,589
Weighted Average Grant-Date Fair Value        
Outstanding at beginning of year (in dollars per share) $ 22.43 $ 12.40 $ 12.40  
Granted (in dollars per share) 27.26 24.04 17.19  
Vested (in dollars per share) 21.88 14.11 12.40  
Forfeited (in dollars per share) 25.35 0.00 0.00  
Unvested at end of year (in dollars per share) $ 24.83 $ 22.43 $ 12.40 $ 24.83