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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2018
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)
 
2018
 
2017
 
2016
Shares repurchased related to employee stock-based compensation plans(1)
 
3,087,396

 
3,358,417

 
3,354,730

Average purchase price per share
 
$11.32
 
$11.96
 
$7.83
Common shares issued(2)
 
6,392,634

 
6,831,108

 
5,955,045

 
_________ 
(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.