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Stock Based Compensation (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
The total charge to operations for all incentive plans is as follows:          
Share based compensation charged to operations   $ 915,000 $ 740,000 $ 1,657,000 $ 1,406,000
Compensation costs related to non-vested awards that have not yet been recognized   $ 7,584,000   $ 7,584,000  
Restricted stock grants          
Summary of the activity of the incentive plans          
Restricted stock grants       140,100 139,225
Per share grant price (in dollars per share)       $ 24.75 $ 21.74
Deferred compensation to be recognized over vesting period       $ 3,467,000 $ 3,027,000
Number of non-vested shares:          
Non-vested beginning of period (in shares)   626,400 605,000 591,750 538,755
Grants (in shares)       140,100 139,225
Vested during period (in shares)   (13,500)   (118,450) (72,730)
Forfeitures (in shares)       (500) (250)
Non-vested end of period (in shares)   612,900 605,000 612,900 605,000
The following information includes the 200,000 Units:          
Average per share value of non-vested shares (based on grant price) (in dollars per share)   $ 22.75 $ 18.00 $ 22.75 $ 18.00
Value of stock vested during the period (based on grant price)   $ 1,248,000   $ 3,008,000 $ 1,177,000
Average per share value of shares forfeited during the period (based on grant price) (in dollars per share)   $ 8.29   $ 8.37 $ 21.05
The total charge to operations for all incentive plans is as follows:          
Share based compensation charged to operations   $ 878,000 $ 641,000 $ 1,571,000 $ 1,291,000
Approximate weighted average vesting period       2 years 8 months 12 days  
Restricted stock units          
The total charge to operations for all incentive plans is as follows:          
Share based compensation charged to operations   $ 37,000 $ 99,000 $ 86,000 $ 115,000
2016 Incentive Plan          
Stock Based Compensation          
Number of shares authorized for issuance   750,000   750,000  
Shares issued pursuant to plan       140,100  
Shares forfeited pursuant to Plan       100  
Shares vested pursuant to Plan       3,000  
2012 Incentive Plan          
Stock Based Compensation          
Shares issued pursuant to plan       500,700  
Shares forfeited pursuant to Plan       3,350  
Shares vested pursuant to Plan       21,450  
Summary of the activity of the incentive plans          
Restricted stock grants       0  
Number of non-vested shares:          
Grants (in shares)       0  
Pay-for-performance program | Restricted stock units          
Stock Based Compensation          
For each unit outstanding, number of shares vested at June 30, 2017 for satisfying performance criteria and issued August 2017 113,584        
Number of non-vested shares:          
Forfeitures (in shares) (86,416)        
Non-vested end of period (in shares)   200,000   200,000