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STOCKHOLDERS' EQUITY - Activity of Equity Incentive Plans (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restricted stock and RSU grants          
Restricted stock and RSU grants:          
Weighted average per share value of non-vested shares (based on grant price) (in dollars per share) $ 25.04 $ 24.98 $ 24.96    
Value of stock vested during the year (based on grant price) $ 5,165,000 $ 3,589,000 $ 2,365,000    
Weighted average per share value of shares forfeited during the year (based on grant price) (in dollars per share) $ 24.62 $ 24.03 $ 25.40    
Total charge to operations:          
Total charge to operations $ 5,433,000 $ 4,686,000 $ 3,870,000    
Restricted stock grants          
Summary of the activity of the incentive plans          
Average per share grant price (in dollars per share) $ 20.34 $ 28.10 $ 25.70    
Deferred compensation to be recognized over vesting period $ 3,082,000 $ 4,202,000 $ 3,856,000    
Number of non-vested shares:          
Non-vested beginning of period (in shares) 701,675 674,250 651,250    
Number of shares awarded 151,500 149,550 150,050    
Vested during period (in shares) (145,725) (122,125) (114,650)    
Forfeitures (in shares) (1,000)   (12,400)    
Non-vested end of period (in shares) 706,450 701,675 674,250 651,250  
Total charge to operations:          
Total charge to operations $ 3,734,000 $ 3,529,000 $ 3,229,000    
Total compensation costs related to non-vested awards that have not yet been recognized $ 7,137,000        
Weighted average vesting period 2 years 1 month 6 days        
Restricted stock units          
Summary of the activity of the incentive plans          
Average per share grant price (in dollars per share) $ 30.46 $ 17.31 $ 28.96    
Deferred compensation to be recognized over vesting period $ 1,808,000 $ 850,000 $ 865,000    
Number of non-vested shares:          
Non-vested beginning of period (in shares) 223,802 225,026 152,500    
Number of shares awarded 80,700 75,026 77,776    
Vested during period (in shares) (73,750) (24,343)      
Forfeitures (in shares)   (51,907) (5,250)    
Non-vested end of period (in shares) 230,752 223,802 225,026 152,500  
Total charge to operations:          
Total charge to operations $ 1,699,000 $ 1,157,000 $ 641,000    
Total compensation costs related to non-vested awards that have not yet been recognized $ 2,292,000        
Weighted average vesting period 1 year 6 months        
ROC Awards          
Number of non-vested shares:          
Vested during period (in shares) 0        
Forfeitures (in shares) 0        
Total charge to operations:          
Weighted average vesting period 3 years        
2019 Incentive Plan | Restricted stock and RSU grants          
Number of non-vested shares:          
Number of shares awarded 524,952        
2019 Incentive Plan | Restricted stock grants          
Number of non-vested shares:          
Number of shares awarded 294,200        
2019 Incentive Plan | Restricted stock units          
Number of non-vested shares:          
Number of shares awarded 230,752        
2016 Incentive Plan | Restricted stock and RSU grants          
Number of non-vested shares:          
Non-vested end of period (in shares) 412,250        
2016 Incentive Plan | Restricted stock units | Awards granted in 2017          
Number of non-vested shares:          
Number of shares awarded         76,250
Vested during period (in shares)   (24,343)      
Forfeitures (in shares)   (51,907)      
2016 Incentive Plan | Restricted stock units | Awards granted in 2018          
Number of non-vested shares:          
Number of shares awarded       76,250  
Vested during period (in shares) (73,750)        
Forfeitures (in shares)     (2,500)