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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2013
Shareholders' Equity  
Schedule of summary of shares granted and vested
 
   Number of Shares   Weighted Average
Grant Date
Fair Value		  

Unvested shares at December 31, 2010

     118,670   $ 21.83  

Shares granted in 2011

     82,450   $ 23.84  

Shares vested in 2011

     (68,500 ) $ 23.36  
             
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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  
             
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