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Shareholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Summary of details activity in our common stock
The following table details activity in our common stock:
 
 
Three Months Ended March 31,
 
 
2018
 
2017
 
 
Shares
 
Amount
 
Shares
 
Amount
Purchases of treasury shares
 
—

 
$
—

 
(42
)
 
$
(6,171
)
Stock option exercises
 
350

 
19,298

 
324

 
14,851

Employee stock plan purchases
 
12

 
1,798

 
14

 
1,650