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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 |

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