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Shareholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2018
Equity [Abstract]  
Summary of details activity in our common stock
The following table details activity in our common stock:
 
 
Nine Months Ended September 30,
 
 
2018
 
2017
 
 
Shares
 
Amount
 
Shares
 
Amount
Purchases of treasury shares
 
—

 
$
—

 
(42
)
 
$
(6,171
)
Stock option exercises
 
1,048

 
70,536

 
787

 
33,568

Employee stock plan purchases
 
35

 
$
5,978

 
40

 
$
5,342