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Weighted Average Common Shares (Tables)
9 Months Ended
Sep. 30, 2011
Weighted Average Common Shares [Abstract] 
Schedule of Weighted Average Number of Shares [Table Text Block]
                                 
    Three Months     Nine Months  
    Ended September 30,     Ended September 30,  
    2011     2010     2011     2010  
            (In thousands)          
Common shares — basic
    337,380       325,452       336,721       325,166  
Effect of dilutive securities
                               
Restricted common stock
    1,268       1,369       1,372       1,354  
Stock options
    1,574       813       1,745       822  
 
                       
Common shares — diluted
    340,222       327,634       339,838       327,342