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STOCKHOLDERS' EQUITY - Restricted Stock and Performance Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]    
Unrecognized compensation cost $ 19,796 $ 17,034
Period for unrecognized compensation cost to be recognized over 1 year 7 months 6 days  
Estimated share-based compensation expense $ 11,400  
Restricted stock    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Non-vested balance as of beginning of period (in shares) 159 138
Granted (in shares) 37 35
Vested (in shares) (13) (20)
Forfeited (in shares) (2) (1)
Non-vested balance as of end of period (in shares) 181 152
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]    
Non-vested balance as of beginning of period (in dollars per share) $ 90.71 $ 80.03
Granted (in dollars per share) 119.30 110.72
Vested (in dollars per share) 87.33 67.59
Forfeited (in dollars per share) 85.60 86.82
Non-vested balance as of end of period (in dollars per share) $ 96.89 $ 89.22
Performance shares    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Non-vested balance as of beginning of period (in shares) 71 70
Granted (in shares) 36 20
Vested (in shares) (24) (8)
Forfeited (in shares) (11) (11)
Non-vested balance as of end of period (in shares) 72 71
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]    
Non-vested balance as of beginning of period (in dollars per share) $ 91.99 $ 81.26
Granted (in dollars per share) 108.74 126.46
Vested (in dollars per share) 70.64 104.15
Forfeited (in dollars per share) 74.57 82.71
Non-vested balance as of end of period (in dollars per share) $ 110.22 $ 91.99
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]    
Risk-free interest rate 0.20% 1.40%
Dividend yield rate 0.60% 0.50%
Expected volatility rate 33.00% 24.00%
Initial TSR 11.70% 10.90%
Cliff vest 100.00%