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Stock Based Compensation (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2019 | Sep. 30, 2018
Total charge to operations: |  |  |  |  |
Share based compensation charged to operations | $ 942,000 | $ 971,000 |  | $ 2,834,000 | $ 2,653,000
Restricted stock and RSU grants |  |  |  |  |
Restricted stock and RSU grants: |  |  |  |  |
Weighted average per share value of non-vested shares (based on grant price) (in dollars per share) | $ 24.98 | $ 23.83 |  | $ 24.98 | $ 23.83
Value of stock vested during the year (based on grant price) | $ 61,500 |  |  | $ 2,365,000 | $ 2,289,000
Weighted average per share value of shares forfeited during the year (based on grant price) (in dollars per share) | $ 24.41 | $ 23.39 |  | $ 24.41 | $ 23.59
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 |  | $ 3,856,000 | $ 3,664,000
Number of non-vested shares: |  |  |  |  |
Non-vested beginning of period (in shares) | 689,150 | 651,500 |  | 651,250 | 612,900
Number of shares awarded |  |  |  | 150,050 | 144,750
Vested during year (in shares) | (2,500) |  |  | (114,650) | (106,000)
Forfeitures (in shares) | (12,400) | (250) |  | (12,400) | (400)
Non-vested end of period (in shares) | 674,250 | 651,250 |  | 674,250 | 651,250
Total charge to operations: |  |  |  |  |
Share based compensation charged to operations | $ 717,000 | $ 763,000 |  | $ 2,403,000 | $ 2,263,000
Total compensation costs related to non-vested awards that have not yet been recognized | $ 7,965,000 |  |  | $ 7,965,000 |
Approximate weighted average remaining vesting period |  |  |  | 2 years 4 months 24 days |
RSUs |  |  |  |  |
Summary of the activity of the incentive plans |  |  |  |  |
Average per share grant price (in dollars per share) | $ 28.96 | $ 26.41 |  | $ 28.96 | $ 26.41
Deferred compensation to be recognized over vesting period | $ 923,000 | $ 1,136,000 |  | $ 923,000 | $ 1,136,000
Number of non-vested shares: |  |  |  |  |
Non-vested beginning of period (in shares) | 152,500 | 76,250 |  | 152,500 | 76,250
Number of shares awarded | 77,776 | 76,250 | 76,250 | 77,776 | 76,250
Vested during year (in shares) |  |  |  | 0 |
Forfeitures (in shares) |  |  |  | 0 |
Non-vested end of period (in shares) | 230,276 | 152,500 |  | 230,276 | 152,500
Total charge to operations: |  |  |  |  |
Share based compensation charged to operations | $ 225,000 | $ 208,000 |  | $ 431,000 | $ 390,000
Total compensation costs related to non-vested awards that have not yet been recognized | $ 1,559,000 |  |  | $ 1,559,000 |
Approximate weighted average remaining vesting period |  |  |  | 1 year 9 months 18 days |
TSR Awards |  |  |  |  |
Stock Based Compensation |  |  |  |  |
Percentage of RSUs to vest upon achievement of specified criteria |  |  |  | 50.00% |
TSR Awards | Awards granted in 2019 |  |  |  |  |
Valuation assumptions |  |  |  |  |
Expected life |  |  |  | 3 years |
Dividend rate |  |  |  | 6.22% |
Risk-free interest rate minimum |  |  |  | 1.79% |
Risk-free interest rate maximum |  |  |  | 2.07% |
Expected price volatility minimum |  |  |  | 21.37% |
Expected price volatility maximum |  |  |  | 23.04% |
ROC Awards |  |  |  |  |
Stock Based Compensation |  |  |  |  |
Percentage of RSUs to vest upon achievement of specified criteria |  |  |  | 50.00% |
2019 Incentive Plan |  |  |  |  |
Stock Based Compensation |  |  |  |  |
Maximum number of shares authorized for issuance | 750,000 |  |  | 750,000 |
2019 Incentive Plan | RSUs |  |  |  |  |
Number of non-vested shares: |  |  |  |  |
Number of shares awarded |  |  |  | 77,776 |
2016 and 2012 Incentive Plans | Restricted stock and RSU grants |  |  |  |  |
Number of non-vested shares: |  |  |  |  |
Non-vested end of period (in shares) | 826,750 |  |  | 826,750 |
Pay-for-performance program | RSUs | Awards granted in 2017 |  |  |  |  |
Summary of the activity of the incentive plans |  |  |  |  |
Aggregate fair value of the shares granted | $ 787,000 |  |  | $ 787,000 |
Pay-for-performance program | RSUs | Awards granted in 2018 |  |  |  |  |
Summary of the activity of the incentive plans |  |  |  |  |
Aggregate fair value of the shares granted | 856,000 |  |  | 856,000 |
Pay-for-performance program | RSUs | Awards granted in 2019 |  |  |  |  |
Summary of the activity of the incentive plans |  |  |  |  |
Aggregate fair value of the shares granted | $ 923,000 |  |  | $ 923,000 |

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