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Shareholders' Equity
 9 Months Ended
Sep. 30, 2017
Equity [Abstract]  
Shareholders' Equity
Shareholders’ Equity

The following table details activity in our common stock:
 
 
Nine months ended September 30,
 
 
2017
 
2016
 
 
Shares
 
Amount
 
Shares
 
Amount
Purchases of treasury shares
 
(42
)
 
$
(6,171
)
 
(758
)
 
$
(94,499
)
Stock option exercises
 
787

 
33,568

 
564

 
15,089

Employee stock plan purchases
 
40

 
5,342

 
34

 
4,429


As of September 30, 2017, we had authorization from our board of directors to repurchase up to 2.0 million additional shares of Tyler common stock.