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Weighted Average Common Shares
6 Months Ended
Jun. 30, 2011
Weighted Average Common Shares [Abstract]  
Weighted Average Common Shares
11. Weighted Average Common Shares
     The weighted average numbers of common shares used in the basic and diluted earnings per share computations are as follows:
                                             
    Three Months     Six Months  
    Ended June 30,     Ended June 30,  
    2011     2010     2011     2010  
    (In thousands)  
Common shares — basic
    337,235       325,383       336,435       325,037  
Effect of dilutive securities
                               
Restricted common stock
    1,187       1,251       1,412       1,341  
Stock options
    2,001       848       1,867       815  
 
                       
Common shares — diluted
    340,423       327,482       339,714       327,193  
 
                       
     The Corporation issued 2,142,270 stock options and 713,280 shares of restricted stock during the six months ended June 30, 2011 (2,738,625 and 927,470 shares, respectively, for the same period in 2010). The weighted average common shares used in the diluted earnings per share calculations excludes the effect of 1,618,000 shares and 2,153,000 shares related to out-of-the-money options for the three and six months ended June 30, 2011 (4,224,000 and 4,230,000 shares for the same period in 2010).