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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2017
Equity [Abstract]  
Common Share Repurchases and Issuances

The following table summarizes common share repurchases and issuances.

 

     Three Months Ended March 31,  
     2017      2016  

Common shares repurchased(1)

      7,363,292        19,210,281  

Average purchase price per share

    $ 14.95      $ 10.42  

Shares repurchased related to employee stock-based compensation plans(2)

      1,354,280        986,273  

Average purchase price per share

    $ 15.55      $ 9.96  

Common shares issued(3)

      2,794,510        2,499,585  

 

(1)  Common shares purchased under our share repurchase program.
(2)  Comprises shares withheld from stock option exercises and vesting of restricted stock for employees’ tax withholding obligations and shares tendered by employees to satisfy option exercise costs.
(3)  Common shares issued under our various compensation and benefit plans.