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STOCKHOLDERS' EQUITY - Activity of the Plans (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Restricted stock and RSU grants        
Restricted stock and RSU grants (based on grant price):        
Weighted average per share value of non-vested shares (in dollars per share) $ 26.25 $ 24.53 $ 26.25 $ 24.53
Value of stock vested during the period $ 2,299,000 $ 2,340,000 $ 5,535,000 $ 5,165,000
Weighted average per share value of shares forfeited during the period (in dollars per share) $ 28.91 $ 24.86 $ 29.12 $ 24.24
Total charge to operations:        
Total charge to operations $ 1,559,000 $ 1,685,000 $ 2,884,000 $ 3,028,000
Restricted stock grants        
Summary of the activity of the incentive plans        
Average per share grant price (in dollars per share)     $ 33.75 $ 20.34
Deferred compensation to be recognized over vesting period $ 5,183,000 $ 3,082,000 $ 5,183,000 $ 3,082,000
Number of non-vested shares:        
Non-vested beginning of period (in shares) 728,775 723,050 706,450 701,675
Number of shares granted     153,575 151,500
Vested during period (in shares) (16,150) (15,800) (146,900) (145,725)
Forfeitures (in shares) (250) (200) (750) (400)
Non-vested end of period (in shares) 712,375 707,050 712,375 707,050
Total charge to operations:        
Total charge to operations $ 1,197,000 $ 1,092,000 $ 2,154,000 $ 1,989,000
Weighted average vesting period     2 years 7 months 6 days  
Restricted stock grants | General and administrative expense        
Total charge to operations:        
Total compensation costs related to non-vested awards that have not yet been recognized $ 10,142,000   $ 10,142,000  
Restricted stock units        
Number of non-vested shares:        
Non-vested beginning of period (in shares) 230,752 223,802 230,752 223,802
Vested during period (in shares) (64,488) (73,750) (64,488) (73,750)
Forfeitures (in shares) (10,538)   (10,538)  
Non-vested end of period (in shares) 155,726 150,052 155,726 150,052
Total charge to operations:        
Total charge to operations $ 362,000 $ 593,000 $ 730,000 $ 1,039,000
Weighted average vesting period     1 year 6 months  
Restricted stock units | General and administrative expense        
Total charge to operations:        
Total compensation costs related to non-vested awards that have not yet been recognized $ 1,601,000   $ 1,601,000