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SUMMARY OF RESTRICTED STOCK UNITS (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 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) 383,547   383,547   327,798
Granted (in shares) 0 2,502 175,544 116,771  
Vested (in shares)     (116,858)    
Forfeited (in shares)     (2,937)    
Unvested, Weighted Average Fair Value (in dollars per share) $ 60.46   $ 60.46   $ 57.87
Granted, Weighted Average Fair Value (in dollars per share) $ 0 $ 59.95 54.64 $ 62.75  
Vested in Period, Weighted Average Fair Value (in dollars per share)     44.32    
Forfeited in Period, Weighted Average Fair Value (in dollars per share)     $ 56.16