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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Schedule of common share repurchases
The following table summarizes our common share repurchases and issuances.
 
 
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
(Shares and per share amounts in actuals)
 
2018
 
2017
 
2018
 
2017
Shares repurchased related to employee stock-based compensation plans(1)(2)
 
200,577

 
981,477

 
2,940,595

 
2,584,964

Average purchase price per share
 
$
11.60

 
$
12.39

 
$
11.33

 
$
12.12

Common shares issued(3)
 
384,955

 
1,491,057

 
5,944,946

 
5,229,774

             
__________________
(1) 
Comprised of 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) 
At the present time, we do not intend to initiate a publicly announced share repurchase program.
(3) 
Common shares issued under our various compensation and benefit plans.