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Stock Based Compensation (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Total charge to operations:    
Share based compensation charged to operations $ 954,000 $ 826,000
Restricted stock    
Stock Based Compensation    
Vesting period 5 years  
Summary of the activity of the incentive plans    
Average per share grant price (in dollars per share) $ 25.70 $ 25.31
Deferred compensation to be recognized over vesting period $ 3,856,000 $ 3,664,000
Non-vested beginning of year (in shares) 651,250 612,900
Number of non-vested shares:    
Non-vested beginning of year (in shares) 651,250 612,900
Number of shares awarded 150,050 144,750
Vested during year (in shares) (112,150) (106,000)
Non-vested end of year (in shares) 689,150 651,650
Restricted stock and RSU grants:    
Weighted average per share value of non-vested shares (based on grant price) (in dollars per share) $ 24.60 $ 23.56
Value of stock vested during the year (based on grant price) $ 2,304,000 $ 2,289,000
Total charge to operations:    
Share based compensation charged to operations 843,000 $ 735,000
Compensation costs related to non-vested awards that have not yet been recognized $ 9,828,000  
Approximate weighted average remaining 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) 152,500 76,250
Number of non-vested shares:    
Non-vested beginning of year (in shares) 152,500 76,250
Forfeitures (in shares) 0  
Non-vested end of year (in shares) 152,500 76,250
Total charge to operations:    
Share based compensation charged to operations $ 111,000 $ 91,000
Compensation costs related to non-vested awards that have not yet been recognized $ 1,035,000  
Approximate weighted average remaining vesting period 1 year 9 months 18 days  
2016 Incentive Plan    
Stock Based Compensation    
Maximum number of shares authorized for issuance 750,000  
Shares vested pursuant to Plan 3,000  
2016 Incentive Plan | Restricted stock    
Stock Based Compensation    
Number of shares issued 434,900  
Number of non-vested shares:    
Forfeitures (in shares) (300)  
2016 Incentive Plan | RSUs    
Number of non-vested shares:    
Non-vested end of year (in shares) 152,500  
2012 Equity Incentive Plan    
Stock Based Compensation    
Number of shares issued 500,700  
Shares forfeited pursuant to Plan 3,550  
Shares vested pursuant to Plan 239,600  
Additional awards authorized 0  
Pay-for-performance program | 2017 RSU grants | General and administrative expense    
Summary of the activity of the incentive plans    
Deferred compensation to be recognized over vesting period $ 864,000  
Pay-for-performance program | 2018 RSU grants | General and administrative expense    
Summary of the activity of the incentive plans    
Deferred compensation to be recognized over vesting period $ 858,000