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STOCK-BASED AWARDS - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Weighted Average Grant Date Fair Value      
Common stock, shares authorized 100,000,000   100,000,000
Common stock, shares issued 46,589,000   46,331,000
Stock-based compensation expense $ 2,305 $ 2,681  
Restricted Stock Awards      
Units      
Outstanding-beginning of year (in shares) 639,000    
Granted at fair value (in shares) 297,000    
Vested (in shares) (258,000)    
Forfeited (in shares) (22,000)    
Outstanding-end of period (in shares) 656,000    
Weighted Average Grant Date Fair Value      
Outstanding-beginning of year (in dollars per share) $ 17.98    
Granted at fair value (in dollars per share) 87.92    
Vested (in dollars per share) 25.57    
Forfeited (in dollars per share) 28.90    
Outstanding-end of period (in dollars per share) $ 46.32    
Restricted Stock Awards | First year      
Stock-Based Awards      
Annual award vesting percentage 33.30%    
Restricted Stock Awards | Second year      
Stock-Based Awards      
Annual award vesting percentage 33.30%    
Restricted Stock Awards | Third year      
Stock-Based Awards      
Annual award vesting percentage 33.40%