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STOCKHOLDERS' EQUITY (Details) (USD $)
 0 Months Ended 12 Months Ended
Sep. 14, 2010
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stock Based Compensation        
Outstanding options at the end of the period (in shares)   0 0 0
The total charge to operations for all incentive plans, including the 200,000 Units, is as follows:        
Share based compensation charged to operations   $ 1,440,000 $ 1,223,000 $ 1,009,000
Compensation costs related to nonvested awards that have not yet been recognized   4,219,000    
Approximate weighted average vesting period   2 years 7 months 6 days    
Restricted stock grants
        
Stock Based Compensation        
Vesting period   5 years    
Summary of the activity of the incentive plans        
Restricted share grants   112,650 109,450 74,040
Average per share grant price (in dollars per share)   $ 21.59 $ 16.77 $ 16.19
Deferred compensation to be recognized over vesting period   2,432,000 1,835,000 1,199,000
Non-vested shares:        
Non-vested beginning of period (in shares)   407,460 348,385 320,940
Grants (in shares)   112,650 109,450 74,040
Vested during period (in shares)   (50,095) (49,325) (46,450)
Forfeitures (in shares)     (1,050) (145)
Non-vested end of period (in shares)   470,015 407,460 348,385
Other disclosures        
Average per share value of non-vested shares (based on grant price) (in dollars per share)   $ 14.22 $ 12.59 $ 12.96
Value of shares vested during the period (based on grant price)   876,000 1,208,000 960,000
Average value of shares forfeited (based on grant price) (in dollars per share)     $ 13.65 $ 11.03
The total charge to operations for all incentive plans, including the 200,000 Units, is as follows:        
Share based compensation charged to operations   1,341,000 1,050,000 930,000
Restricted stock units
        
The total charge to operations for all incentive plans, including the 200,000 Units, is as follows:        
Share based compensation charged to operations   99,000 173,000 79,000
2012 Incentive Plan
        
Stock Based Compensation        
Number of shares authorized for issuance   600,000    
Shares issued pursuant to plan   112,650    
Number of share instruments vested since plan's inception   50    
Prior Incentive Plans
        
Non-vested shares:        
Non-vested end of period (in shares)   557,415    
Pay-for-performance program
        
The total charge to operations for all incentive plans, including the 200,000 Units, is as follows:        
Compensation costs related to nonvested awards that have not yet been recognized   401,000    
Pay-for-performance program | Restricted stock units
        
Stock Based Compensation        
Vesting period 7 years      
Number of shares to be vested and issued for each unit outstanding on satisfying performance criteria at June 30, 2017   1    
Number of shares to be issued for each unit outstanding on not satisfying performance criteria at June 30, 2017   0    
Summary of the activity of the incentive plans        
Restricted share grants 200,000      
Average per share grant price (in dollars per share) $ 11.74      
Deferred compensation to be recognized over vesting period $ 779,000      
Non-vested shares:        
Grants (in shares) 200,000      
Vested during period (in shares)   0 0 0
Forfeitures (in shares)   0 0 0