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Dividends (Tables)
3 Months Ended
Mar. 31, 2013
Dividends  
Schedule of dividends paid during the year on the entity's issued and outstanding common stock

The Company paid the following quarterly dividends during the three months ended March 31, 2013 and 2012 on its issued and outstanding common stock:

Record Date
  Payment
Date
  Aggregate
Payment
  Per Share
Payment
 

March 7, 2013

  March 28, 2013   $ 21.4 million   $ 0.64  

March 8, 2012

  March 29, 2012   $ 18.3 million   $ 0.55