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Stock Based Compensation (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Total charge to operations:        
Share based compensation charged to operations $ 856,000 $ 915,000 $ 1,682,000 $ 1,657,000
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) 651,650 626,400 612,900 591,750
Number of non-vested shares:        
Non-vested beginning of year (in shares) 651,650 626,400 612,900 591,750
Vested during year (in shares)   (13,500) (106,000) (118,450)
Forfeitures (in shares) (150)   (150) (500)
Non-vested end of year (in shares) 651,500 612,900 651,500 612,900
Restricted stock and RSU grants:        
Weighted average per share value of non-vested shares (based on grant price) (in dollars per share) $ 23.56 $ 22.75 $ 23.56 $ 22.75
Value of stock vested during the year (based on grant price)   $ 1,248,000 $ 2,289,000 $ 3,008,000
Weighted average per share value of shares forfeited during the year (based on grant price) (in dollars per share) $ 23.93 $ 8.29 $ 23.93 $ 8.37
Total charge to operations:        
Share based compensation charged to operations $ 765,000 $ 878,000 $ 1,500,000 $ 1,571,000
Compensation costs related to non-vested awards that have not yet been recognized $ 8,349,000   $ 8,349,000  
Approximate weighted average vesting period     2 years 8 months 12 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 76,250 200,000
Number of non-vested shares:        
Non-vested beginning of year (in shares) 76,250 200,000 76,250 200,000
Vested during year (in shares)   (113,584)   (113,584)
Forfeitures (in shares)   (86,416) 0 (86,416)
Non-vested end of year (in shares) 76,250   76,250  
Total charge to operations:        
Share based compensation charged to operations $ 91,000 $ 37,000 $ 182,000 $ 86,000
Compensation costs related to non-vested awards that have not yet been recognized $ 728,000   $ 728,000  
Approximate weighted average vesting period     2 years  
2016 Incentive Plan        
Stock Based Compensation        
Number of shares authorized for issuance 750,000   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)     (200)  
2016 Incentive Plan | RSUs        
Number of non-vested shares:        
Non-vested end of year (in shares) 76,250   76,250  
2012 Incentive Plan        
Stock Based Compensation        
Shares issued pursuant to plan     500,700  
Shares forfeited pursuant to Plan     3,400  
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     $ 1,005,000