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EMPLOYEE BENEFIT PLANS (Restrictive Stock Units) (Details) - Restricted Stock Units (RSUs) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Unvested restricted stock at beginning of period (in shares) 854  
Granted (in shares) 499  
Vested (in shares) (438)  
Canceled (in shares) (51)  
Unvested restricted stock at end of period (in shares) 864 854
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]    
Unvested restricted stock at beginning of period (in dollars per share)   $ 344.10
Granted (in dollars per share) $ 764.00  
Vested (in dollars per share) 264.75  
Canceled (in dollars per share) 477.50  
Unvested restricted stock at end of period (in dollars per share) $ 618.97