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