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Retirement Plans and Employee Stock Purchase Plans (Tables)
 12 Months Ended
Dec. 31, 2014
Retirement Plans and Employee Stock Purchase Plans  
Schedule of purchases made under the 2009 Employee Stock Purchase Plans

                                                                                                                                                                                    

 

 

Year Ended December 31,

 

 

 

2014

 

2013

 

2012

 

Number of shares purchased

 

 
295,035 

 

 
299,786 

 

 
487,451 

 

Average price of shares purchased

 

$
12.72 

 

$
12.33 

 

$
8.35