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Retirement Plans and Employee Stock Purchase Plans (Tables)
12 Months Ended
Dec. 31, 2013
Retirement Plans and Employee Stock Purchase Plans  
Schedule of purchases made under the 2009 Employee Stock Purchase Plans
  Year Ended December 31,  
 
  2013   2012   2011  

Number of shares purchased

    299,786     487,451     300,177  

Average price of shares purchased

  $ 12.33   $ 8.35   $ 14.56