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

 
$
—

 
(42
)
 
$
(6,171
)
Stock option exercises
 
722

 
44,317

 
534

 
23,360

Employee stock plan purchases
 
23

 
$
3,760

 
27

 
$
3,427