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Shareholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2017
Equity [Abstract]  
Summary of Activities in Common Stock
The following table details activity in our common stock:
 
 
Three Months ended March 31,
 
 
2017
 
2016
 
 
Shares
 
Amount
 
Shares
 
Amount
Purchases of treasury shares
 
(42
)
 
$
(6,171
)
 
(758
)
 
$
(94,497
)
Stock option exercises
 
324

 
14,851

 
79

 
1,781

Employee stock plan purchases
 
14

 
1,650

 
8

 
1,238