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Stock Based Compensation (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
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 $ 580,000 $ 448,000 $ 1,742,000 $ 1,368,000
Compensation costs related to non-vested awards that have not yet been recognized $ 6,311,000   $ 6,311,000  
Approximate weighted average vesting period     2 years 3 months 18 days  
Restricted stock grants        
Summary of the activity of the incentive plans        
Restricted share grants     129,975 118,850
Per share grant price (in dollars per share)     $ 24.60 $ 20.54
Deferred compensation to be recognized over vesting period     $ 3,197,000 $ 2,441,000
Number of non-vested shares:        
Non-vested beginning of period (in shares) 538,990 481,045 480,995 470,015
Grants (in shares)     129,975 118,850
Vested during period (in shares)     (71,980) (101,300)
Forfeitures (in shares)   (50)   (6,570)
Non-vested end of period (in shares) 538,990 480,995 538,990 480,995
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) $ 17.12 $ 14.55 $ 17.12 $ 14.55
Value of shares vested during the period (based on grant price)     $ 607,000 $ 621,000
Share based compensation charged to operations $ 550,000 $ 419,000 1,653,000 1,281,000
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 $ 30,000 $ 29,000 $ 89,000 $ 87,000
2012 Incentive Plan        
Stock Based Compensation        
Number of shares authorized for issuance 600,000   600,000  
Shares issued pursuant to plan     359,000  
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) 380,000   380,000  
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   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 $ 207,000   $ 207,000