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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2014
Shareholders' Equity |
Schedule of summary of shares granted and vested |
|  |  |  | Weighted Average |
|  |  |  | Grant Date |
|  | Number of Shares |  | Fair Value |
Unvested shares at December 31, 2011 |  | 132,620 |  | $ | 22.86 |
Shares granted in 2012 |  | 87,092 |  | $ | 22.38 |
Shares vested in 2012 |  | (79,678) |  | $ | 22.18 |
Unvested shares at December 31, 2012 |  | 140,034 |  | $ | 23.03 |
Shares granted in 2013 |  | 92,075 |  | $ | 23.48 |
Shares vested in 2013 |  | (81,398) |  | $ | 23.85 |
Unvested shares at December 31, 2013 |  | 150,711 |  | $ | 23.84 |
Shares granted in 2014 |  | 94,200 |  | $ | 21.83 |
Shares vested in 2014 |  | (91,433) |  | $ | 21.87 |
Unvested shares at December 31, 2014 |  | 153,477 |  | $ | 23.39 |

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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=6415400&loc=d3e5070-113901 + Details
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