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Stock Based Compensation (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 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 $ 740,000 $ 585,000 $ 1,406,000 $ 1,162,000
Compensation costs related to non-vested awards that have not yet been recognized $ 7,417,000   $ 7,417,000  
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     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) 605,000 540,285 538,755 480,995
Grants (in shares)     139,225 129,975
Vested during period (in shares)   (1,295) (72,730) (71,980)
Forfeitures (in shares)     (250)  
Non-vested end of period (in shares) 605,000 538,990 605,000 538,990
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 $ 18.00 $ 17.12
Value of shares vested during the period (based on grant price)   $ 21,000 $ 1,177,000 $ 607,000
Average value of shares forfeited during the period (based on grant price) (in dollars per share)     $ 21.05  
Share based compensation charged to operations $ 641,000 555,000 $ 1,291,000 1,103,000
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 $ 99,000 $ 30,000 $ 115,000 $ 59,000
2012 and 2009 Incentive Plan        
Number of non-vested shares:        
Vested during period (in shares)     0  
Non-vested end of period (in shares) 805,000   805,000  
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 $ 130,000   $ 130,000  
2016 Incentive Plan        
Stock Based Compensation        
Number of shares authorized for issuance 750,000   750,000