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Stock Based Compensation (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Total charge to operations and other disclosure for all incentive plans, including the 200,000 Units, is as follows:    
Share based compensation charged to operations $ 665,700 $ 577,000
Compensation costs related to non-vested awards that have not yet been recognized $ 8,080,000  
Approximate weighted average vesting period 2 years 6 months  
Restricted stock grants    
Summary of the activity of the incentive plans    
Restricted share grants 139,225 129,975
Per share grant price (in dollars per share) $ 21.74 $ 24.60
Deferred compensation to be recognized over vesting period $ 3,027,000 $ 3,197,000
Number of non-vested shares:    
Non-vested beginning of period (in shares) 538,755 480,995
Grants (in shares) 139,225 129,975
Vested during period (in shares) (72,730) (70,685)
Forfeitures (in shares) (250)  
Non-vested end of period (in shares) 605,000 540,285
Total charge to operations and other disclosure for all incentive plans, including the 200,000 Units, is as follows:    
Average per share value of non-vested shares (based on grant price) (in dollars per share) $ 18.00 $ 17.12
Value of shares vested during the period (based on grant price) $ 1,177,000 $ 586,000
Average value of shares forfeited during the period (based on grant price) (in dollars per share) $ 21.05  
Share based compensation charged to operations $ 649,500 548,000
Restricted stock units    
Total charge to operations and other disclosure for all incentive plans, including the 200,000 Units, is as follows:    
Share based compensation charged to operations $ 16,200 $ 29,000
2012 Incentive Plan    
Stock Based Compensation    
Number of shares authorized for issuance 600,000  
Shares issued pursuant to plan 497,500  
Number of non-vested shares:    
Vested during period (in shares) 0  
2009 Incentive Plan    
Summary of the activity of the incentive plans    
Restricted share grants 0  
Number of non-vested shares:    
Grants (in shares) 0  
Non-vested end of period (in shares) 307,500  
2009 Incentive Plan | Restricted stock units    
Number of non-vested shares:    
Vested during period (in shares) 0  
Forfeitures (in shares) 0  
Non-vested end of period (in shares) 200,000  
Total charge to operations and other disclosure for all incentive plans, including the 200,000 Units, is as follows:    
Compensation costs related to non-vested awards that have not yet been recognized $ 151,000