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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Stockholders' Equity Note [Abstract] |
Schedule of summary of shares granted and vested | A summary of shares granted, forfeited, vested and unvested under the terms of the 2012 Plan from January 1, 2015 to December 31, 2017 is as follows:
| Number of Shares |  | Weighted Average Grant Date Fair Value
Unvested shares at December 31, 2014 | 153,478 |  |  | $ | 23.39 |
Shares granted in 2015 | 99,000 |  |  | $ | 16.30 |
Shares vested / forfeited in 2015 | (93,604 | ) |  | $ | 16.17 |
Unvested shares at December 31, 2015 | 158,874 |  |  | $ | 19.39 |
Shares granted in 2016 | 92,150 |  |  | $ | 21.18 |
Shares vested / forfeited in 2016 | (97,614 | ) |  | $ | 21.09 |
Unvested shares at December 31, 2016 | 153,410 |  |  | $ | 19.92 |
Shares granted in 2017 | 103,100 |  |  | $ | 19.99 |
Shares vested / forfeited in 2017 | (108,500 | ) |  | $ | 20.05 |
Unvested shares at December 31, 2017 | 148,010 |  |  | $ | 19.71 |

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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