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Shareholders' Equity
 6 Months Ended
Jun. 30, 2017
Equity [Abstract]  
Shareholders' Equity
Shareholders’ Equity

The following table details activity in our common stock:
 
 
Six months ended June 30,
 
 
2017
 
2016
 
 
Shares
 
Amount
 
Shares
 
Amount
Purchases of treasury shares
 
(42
)
 
$
(6,171
)
 
(758
)
 
$
(94,497
)
Stock option exercises
 
534

 
23,360

 
241

 
5,793

Employee stock plan purchases
 
27

 
3,427

 
23

 
2,818


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