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 36 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Number of Restricted Common Shares        
Outstanding at beginning of year (in shares) 13,590 11,000 0 0
Granted (in shares) 16,525 8,090 17,210 41,825
Vested (in shares) (8,530) (5,500) (6,000)  
Forfeited (in shares) 0 0 (210)  
Unvested at end of year (in shares) 21,585 13,590 11,000 21,585
Weighted Average Grant-Date Fair Value        
Outstanding at beginning of year (in dollars per share) $ 12.40 $ 12.40 $ 0.00 $ 0.00
Granted (in dollars per share) 24.04 17.19 12.40  
Vested (in dollars per share) 14.11 12.40 12.40  
Forfeited (in dollars per share) 0.00 0.00 12.40  
Unvested at end of year (in dollars per share) $ 22.43 $ 12.40 $ 12.40 $ 22.43