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SHAREHOLDERS' EQUITY (Details) - USD ($)
shares in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Jul. 24, 2020
Feb. 28, 2019
Feb. 28, 2018
Calculation of weighted average common shares          
Weighted average common shares, basic 13,070 12,957      
Effect of dilutive securities          
Effect of stock options (in shares) 658 628      
Effect of dilutive share awards (in shares) 118 104      
Effect of Convertible Senior Notes (in shares) 273 469      
Weighted average common shares, diluted 14,119 14,158      
Common stock repurchases          
Value of common stock authorized to be repurchased       $ 150.0 $ 100.0
Remaining authorized repurchase amount $ 179.7        
2025 Convertible Notes | Convertible Debt          
Effect of dilutive securities          
Stated interest rate     0.50%    
Option          
Effect of dilutive securities          
Antidilutive securities excluded from computation of earnings per share (in shares) 300 100