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Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2017
Equity [Abstract]  
Schedule of common share repurchases
The following table summarizes our common share repurchases and issuances.
 
 
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
(Shares and per share amounts in actuals)
 
2017
 
2016
 
2017
 
2016
Shares repurchased related to employee stock-based compensation plans(1)(2)
 
81,817

 
371,165

 
2,666,781

 
1,763,092

Average purchase price per share
 
$
10.93

 
$
7.22

 
$
12.09

 
$
6.35

Common shares issued(3)
 
423,112

 
561,100

 
5,652,886

 
3,727,574

             
__________________
(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.