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Stock Based Compensation (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Total charge to operations and other disclosure for all incentive plans, including the 200,000 Units, is as follows: |  |  |  |
Share based compensation charged to operations | $ 585,000 | $ 448,000 | $ 1,162,000 | $ 920,000
Compensation costs related to non-vested awards that have not yet been recognized | $ 6,891,000 |  | $ 6,891,000 |
Approximate weighted average vesting period |  |  | 2 years 7 months 6 days |
Restricted stock grants |  |  |  |
Summary of the activity of the incentive plans |  |  |  |
Restricted share grants |  |  | 129,975 | 118,850
Per share grant price (in dollars per share) |  |  | $ 24.60 | $ 20.54
Deferred compensation to be recognized over vesting period |  |  | $ 3,197,000 | $ 2,441,000
Number of non-vested shares: |  |  |  |
Non-vested beginning of period (in shares) | 540,285 | 481,045 | 480,995 | 470,015
Grants (in shares) |  |  | 129,975 | 118,850
Vested during period (in shares) | (1,295) |  | (71,980) | (101,300)
Forfeitures (in shares) |  |  |  | (6,520)
Non-vested end of period (in shares) | 538,990 | 481,045 | 538,990 | 481,045
Total charge to operations and other disclosure for all incentive plans, including the 200,000 Units, is as follows: |  |  |  |
Average per share value of non-vested shares (based on grant price) (in dollars per share) | $ 17.12 | $ 14.55 | $ 17.12 | $ 14.55
Value of shares vested during the period (based on grant price) | $ 21,000 |  | $ 607,000 | $ 621,000
Share based compensation charged to operations | 555,000 | $ 419,000 | 1,103,000 | 862,000
Restricted stock units |  |  |  |
Total charge to operations and other disclosure for all incentive plans, including the 200,000 Units, is as follows: |  |  |  |
Share based compensation charged to operations | $ 30,000 | $ 29,000 | $ 59,000 | $ 58,000
2012 Incentive Plan |  |  |  |
Stock Based Compensation |  |  |  |
Number of shares authorized for issuance | 600,000 |  | 600,000 |
Shares issued pursuant to plan |  |  | 359,000 |
2009 Incentive Plan |  |  |  |
Summary of the activity of the incentive plans |  |  |  |
Restricted share grants |  |  |  | 0
Number of non-vested shares: |  |  |  |
Grants (in shares) |  |  |  | 0
Non-vested end of period (in shares) | 380,000 |  | 380,000 |
2009 Incentive Plan | Restricted stock units |  |  |  |
Number of non-vested shares: |  |  |  |
Vested during period (in shares) |  |  | 0 |
Forfeitures (in shares) |  |  | 0 |
Non-vested end of period (in shares) | 200,000 |  | 200,000 |
Total charge to operations and other disclosure for all incentive plans, including the 200,000 Units, is as follows: |  |  |  |
Compensation costs related to non-vested awards that have not yet been recognized | $ 237,000 |  | $ 237,000 |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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