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Stock Based Compensation (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Total charge to operations:    
Share based compensation charged to operations $ 826,000 $ 742,200
Restricted stock    
Stock Based Compensation    
Vesting period 5 years  
Summary of the activity of the incentive plans    
Number of shares 144,750 140,100
Average per share grant price (in dollars per share) $ 25.31 $ 24.75
Deferred compensation to be recognized over vesting period $ 3,664,000 $ 3,467,000
Non-vested beginning of year (in shares) 612,900 591,750
Number of non-vested shares:    
Non-vested beginning of year (in shares) 612,900 591,750
Vested during year (in shares) (106,000) (104,950)
Forfeitures (in shares)   (500)
Non-vested end of year (in shares) 651,650 626,400
Restricted stock and RSU grants:    
Weighted average per share value of non-vested shares (based on grant price) (in dollars per share) $ 23.56 $ 19.25
Value of stock vested during the year (based on grant price) $ 2,289,000 $ 1,760,000
Weighted average per share value of shares forfeited during the year (based on grant price) (in dollars per share)   $ 22.64
Total charge to operations:    
Share based compensation charged to operations 735,000 $ 693,900
Compensation costs related to non-vested awards that have not yet been recognized $ 9,118,000  
Approximate weighted average vesting period 2 years 10 months 24 days  
RSUs    
Stock Based Compensation    
Percentage of units to be vested on satisfaction of performance criteria of average total stockholder return 50.00%  
Percent of number of units to be vested on satisfaction of performance criteria related to average annual return on capital 50.00%  
Summary of the activity of the incentive plans    
Non-vested beginning of year (in shares) 76,250 200,000
Number of non-vested shares:    
Non-vested beginning of year (in shares) 76,250 200,000
Forfeitures (in shares) 0 0
Non-vested end of year (in shares) 76,250 200,000
Total charge to operations:    
Share based compensation charged to operations $ 91,000 $ 48,300
Compensation costs related to non-vested awards that have not yet been recognized $ 816,000  
Approximate weighted average vesting period 2 years 3 months 18 days  
2016 Incentive Plan    
Stock Based Compensation    
Number of shares authorized for issuance 750,000  
Shares vested pursuant to Plan 3,000  
2016 Incentive Plan | Restricted stock    
Summary of the activity of the incentive plans    
Number of shares 284,850  
Number of non-vested shares:    
Forfeitures (in shares) (100)  
2016 Incentive Plan | RSUs    
Number of non-vested shares:    
Non-vested end of year (in shares) 76,250  
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 127,450  
Summary of the activity of the incentive plans    
Number of shares 0  
Pay-for-performance program | RSUs | General and administrative expense    
Summary of the activity of the incentive plans    
Deferred compensation to be recognized over vesting period $ 1,002,000