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EQUITY COMPENSATION - Restricted Stock (Details) - Restricted Stock - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Nonvested Restricted Share Units    
Beginning balance (in shares) 116,675  
Vested (in shares) (38,404)  
Forfeited (in shares) (2,161)  
Ending balance (in shares) 76,110 116,675
Grant Date Fair Value    
Weighted average beginning balance (in dollars per share) $ 54.03  
Weighted average vested (in dollars per share) 54.35  
Weighted average, forfeited (in dollars per share) 53.88  
Weighted average ending balance (in dollars per share) $ 53.87 $ 54.03
Remaining weighted-average contractual term (in years) 8 months 12 days  
Granted (in shares) 0  
Weighted-average grant-date fair value of shares granted (in dollars per share)   $ 54.05
Total unrecognized compensation expense, $ 0.8  
Total fair value of shares $ 2.1 $ 0.3