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STOCKHOLDERS' EQUITY - Stock Based Compensation (Details) - USD ($)
1 Months Ended 12 Months Ended
Jan. 10, 2019
Jun. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2010
Restricted stock            
Summary of the activity of the incentive plans            
Number of shares awarded     144,750 140,100 139,225  
Average per share grant price (in dollars per share)     $ 25.31 $ 24.75 $ 21.74  
Deferred compensation to be recognized over vesting period     $ 3,664,000 $ 3,467,000 $ 3,027,000  
Number of non-vested shares:            
Non-vested beginning of year (in shares)     612,900 591,750 538,755  
Number of shares awarded     144,750 140,100 139,225  
Vested during year (in shares)     (106,000) (118,450) (85,730)  
Forfeitures (in shares)     (400) (500) (500)  
Non-vested end of year (in shares)     651,250 612,900 591,750  
Total charge to operations:            
Share based compensation charged to operations     $ 3,028,000 $ 2,966,000 $ 2,692,000  
Compensation costs related to non-vested awards that have not yet been recognized     $ 6,815,000      
Approximate weighted average vesting period     2 years 1 month 6 days      
RSUs            
Stock Based Compensation            
Percentage of units to be vested on satisfaction of performance criteria of average total stockholder return     50.00%      
Percent of number of units to be vested on satisfaction of performance criteria related to average annual return on capital     50.00%      
Summary of the activity of the incentive plans            
Number of shares awarded     76,250 76,250    
Average per share grant price (in dollars per share)     $ 26.41 $ 24.03    
Deferred compensation to be recognized over vesting period     $ 952,000 $ 1,004,000    
Number of non-vested shares:            
Non-vested beginning of year (in shares)     76,250 200,000 200,000  
Number of shares awarded     76,250 76,250    
Vested during year (in shares)       (113,584)    
Forfeitures (in shares)       (86,416)    
Non-vested end of year (in shares)     152,500 76,250 200,000  
Total charge to operations:            
Share based compensation charged to operations     $ 482,000 $ 167,000 $ 291,000  
Compensation costs related to non-vested awards that have not yet been recognized     $ 1,290,000      
Approximate weighted average vesting period     2 years      
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)     $ 23.83 $ 22.89 $ 17.95  
Value of stock vested during the year (based on grant price)     $ 2,289,000 $ 3,008,000 $ 1,451,500  
Weighted average per share value of shares forfeited during the year (based on grant price) (in dollars per share)     $ 23.59 $ 8.37 $ 21.05  
Total charge to operations:            
Share based compensation charged to operations     $ 3,510,000 $ 3,133,000 $ 2,983,000  
TSR awards            
Stock Based Compensation            
Expected life     3 years 3 years    
Dividend rate     6.82% 7.16%    
Risk-free interest rate minimum     2.18% 1.14%    
Risk-free interest rate maximum     2.70% 1.64%    
Expected price volatility minimum     22.29% 16.57%    
Expected price volatility maximum     25.99% 19.16%    
2016 Incentive Plan            
Stock Based Compensation            
Maximum number of shares authorized for issuance     750,000      
2016 Incentive Plan | Restricted stock            
Stock Based Compensation            
Number of shares issued 150,050   284,850      
Shares vested pursuant to Plan     3,000      
Aggregate value of restricted shares granted $ 3,856,000          
Number of non-vested shares:            
Forfeitures (in shares)     (300)      
2016 Incentive Plan | RSUs            
Stock Based Compensation            
Number of shares issued     152,500      
2012 Equity Incentive Plan            
Stock Based Compensation            
Number of shares issued     500,700      
Additional awards authorized     0      
Shares forfeited pursuant to Plan     3,550      
Shares vested pursuant to Plan     127,450      
2009 Incentive Plan | RSUs            
Summary of the activity of the incentive plans            
Number of shares awarded           200,000
Number of non-vested shares:            
Number of shares awarded           200,000
Vested during year (in shares)   (113,584)   (113,584)    
Forfeitures (in shares)       (86,416)    
Pay-for-performance program | RSUs | 2017 awards | General and administrative expense            
Summary of the activity of the incentive plans            
Deferred compensation to be recognized over vesting period     $ 915,000      
Pay-for-performance program | RSUs | 2018 awards | General and administrative expense            
Summary of the activity of the incentive plans            
Deferred compensation to be recognized over vesting period     $ 952,000