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EQUITY COMPENSATION - Performance Share Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
RSU With Performance Measures    
Nonvested Restricted Share Units    
Beginning balance (in shares) 0  
Vested (in shares) 0  
Forfeited (in shares) (4,857)  
Ending balance (in shares) 197,250 0
Grant Date Fair Value    
Weighted average beginning balance (in dollars per share) $ 0  
Weighted average, forfeited (in dollars per share) 37.87  
Weighted average ending balance (in dollars per share) $ 37.87 $ 0
Remaining weighted-average contractual term (in years) 2 years 2 months 12 days  
Total unrecognized compensation expense, $ 5.4  
Performance Shares    
Nonvested Restricted Share Units    
Beginning balance (in shares) 348,496  
Vested (in shares) (69,317) 0
Forfeited (in shares) (6,481)  
Performance adjustment (in shares) (44,442)  
Ending balance (in shares) 228,256 348,496
Grant Date Fair Value    
Weighted average beginning balance (in dollars per share) $ 63.80  
Weighted average, vested (in dollars per share) 46.11  
Weighted average, forfeited (in dollars per share) 69.65  
Weighted average, performance adjustment (in dollars per share) 42.97  
Weighted average ending balance (in dollars per share) $ 73.06 $ 63.80
Remaining weighted-average contractual term (in years) 6 months  
Weighted-average grant-date fair value of shares granted (in dollars per share)   $ 63.79
Total unrecognized compensation expense, $ 2.2  
Total fair value of shares $ 3.2