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Stock Based Compensation (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Aug. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
The total charge to operations for all incentive plans is as follows: |  |  |  |  |
Share based compensation charged to operations |  | $ 915,000 | $ 740,000 | $ 1,657,000 | $ 1,406,000
Compensation costs related to non-vested awards that have not yet been recognized |  | $ 7,584,000 |  | $ 7,584,000 |
Restricted stock grants |  |  |  |  |
Summary of the activity of the incentive plans |  |  |  |  |
Restricted stock grants |  |  |  | 140,100 | 139,225
Per share grant price (in dollars per share) |  |  |  | $ 24.75 | $ 21.74
Deferred compensation to be recognized over vesting period |  |  |  | $ 3,467,000 | $ 3,027,000
Number of non-vested shares: |  |  |  |  |
Non-vested beginning of period (in shares) |  | 626,400 | 605,000 | 591,750 | 538,755
Grants (in shares) |  |  |  | 140,100 | 139,225
Vested during period (in shares) |  | (13,500) |  | (118,450) | (72,730)
Forfeitures (in shares) |  |  |  | (500) | (250)
Non-vested end of period (in shares) |  | 612,900 | 605,000 | 612,900 | 605,000
The following information includes the 200,000 Units: |  |  |  |  |
Average per share value of non-vested shares (based on grant price) (in dollars per share) |  | $ 22.75 | $ 18.00 | $ 22.75 | $ 18.00
Value of stock vested during the period (based on grant price) |  | $ 1,248,000 |  | $ 3,008,000 | $ 1,177,000
Average per share value of shares forfeited during the period (based on grant price) (in dollars per share) |  | $ 8.29 |  | $ 8.37 | $ 21.05
The total charge to operations for all incentive plans is as follows: |  |  |  |  |
Share based compensation charged to operations |  | $ 878,000 | $ 641,000 | $ 1,571,000 | $ 1,291,000
Approximate weighted average vesting period |  |  |  | 2 years 8 months 12 days |
Restricted stock units |  |  |  |  |
The total charge to operations for all incentive plans is as follows: |  |  |  |  |
Share based compensation charged to operations |  | $ 37,000 | $ 99,000 | $ 86,000 | $ 115,000
2016 Incentive Plan |  |  |  |  |
Stock Based Compensation |  |  |  |  |
Number of shares authorized for issuance |  | 750,000 |  | 750,000 |
Shares issued pursuant to plan |  |  |  | 140,100 |
Shares forfeited pursuant to Plan |  |  |  | 100 |
Shares vested pursuant to Plan |  |  |  | 3,000 |
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 |  |  |  | 21,450 |
Summary of the activity of the incentive plans |  |  |  |  |
Restricted stock grants |  |  |  | 0 |
Number of non-vested shares: |  |  |  |  |
Grants (in shares) |  |  |  | 0 |
Pay-for-performance program | Restricted stock units |  |  |  |  |
Stock Based Compensation |  |  |  |  |
For each unit outstanding, number of shares vested at June 30, 2017 for satisfying performance criteria and issued August 2017 | 113,584 |  |  |  |
Number of non-vested shares: |  |  |  |  |
Forfeitures (in shares) | (86,416) |  |  |  |
Non-vested end of period (in shares) |  | 200,000 |  | 200,000 |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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