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Shareholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2017
Equity [Abstract]  
Summary of Activities in Common Stock
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