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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2016
Equity [Abstract]  
Class of Treasury Stock
The following table summarizes our common share repurchases and issuances associated with these programs.

 
 
Years Ended December 31,
(Shares and per share amounts in actuals)
 
2016
 
2015
 
2014
Shares repurchased related to employee stock-based compensation plans(1)
 
3,354,730

 
3,008,913

 
1,365,277

Average purchase price per share
 
$
7.83

 
$
9.65

 
$
8.93

Common shares issued(2)
 
5,955,045

 
5,873,309

 
2,013,805

 
(1) 
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.
(2) 
Common shares issued under our various compensation and benefit plans.