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STOCKHOLDERS' EQUITY - Activity of the Plans (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 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) $ 26.26 $ 25.04 $ 26.26 $ 25.04
Value of stock vested during the period     $ 5,535,000 $ 5,165,000
Weighted average per share value of shares forfeited during the period (in dollars per share)   $ 24.84 $ 29.12 $ 24.57
Total charge to operations:        
Total charge to operations $ 1,306,000 $ 1,163,000 $ 4,190,000 $ 4,191,000
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) 712,375 707,050 706,450 701,675
Number of shares granted     153,575 151,500
Vested during period (in shares)     (146,900) (145,725)
Forfeitures (in shares)   (500) (750) (900)
Non-vested end of period (in shares) 712,375 706,550 712,375 706,550
Total charge to operations:        
Total charge to operations $ 951,000 $ 871,000 $ 3,106,000 $ 2,859,000
Weighted average vesting period     2 years 3 months 18 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 $ 9,191,000   $ 9,191,000  
Restricted stock units        
Summary of the activity of the incentive plans        
Average per share grant price (in dollars per share) $ 26.44 $ 30.46 $ 26.44 $ 30.46
Deferred compensation to be recognized over vesting period $ 1,352,000 $ 1,647,000 $ 1,352,000 $ 1,647,000
Number of non-vested shares:        
Non-vested beginning of period (in shares) 155,726 150,052 230,752 223,802
Number of shares granted 85,350 80,700 85,350 80,700
Vested during period (in shares)     (64,488) (73,750)
Forfeitures (in shares)     (10,538)  
Non-vested end of period (in shares) 241,076 230,752 241,076 230,752
Total charge to operations:        
Total charge to operations $ 355,000 $ 292,000 $ 1,084,000 $ 1,332,000
Weighted average vesting period     1 year 9 months 18 days  
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 $ 2,599,000   $ 2,599,000