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SUMMARY OF RESTRICTED STOCK UNITS (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]          
Unvested (in shares) 373,302   373,302   327,798
Granted (in shares) 6,256 2,686 181,800 119,457  
Vested (in shares)     (118,560)    
Forfeited (in shares)     (17,736)    
Unvested, Weighted Average Fair Value (in dollars per share) $ 60.25   $ 60.25   $ 57.87
Granted, Weighted Average Fair Value (in dollars per share) $ 47.95 $ 61.41 54.41 $ 62.72  
Vested in Period, Weighted Average Fair Value (in dollars per share)     44.58    
Forfeited in Period, Weighted Average Fair Value (in dollars per share)     $ 59.57