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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 |

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