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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2016
Equity [Abstract]  
Common Share Repurchases and Issuances

The following table summarizes common share repurchases and issuances.

 

     Three Months Ended
June 30,		      Six Months Ended
June 30,		  
     2016      2015      2016      2015  

Common shares repurchased(1)

      13,579,381         15,190,685         32,789,662         29,844,520   

Average purchase price per share

    $ 12.90       $ 19.76       $ 11.45       $ 20.12   

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

      368,439         431,168         1,354,712         2,075,932   

Average purchase price per share

    $ 13.05       $ 19.83       $ 10.80       $ 20.65   

Common shares issued(3)

      467,007         633,170         2,966,592         4,218,408   

 

(1) 

Common shares purchased under our share repurchase programs.

 

(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.