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Shareholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2019
Equity [Abstract]  
Summary of details activity in our common stock The following table details activity in our common stock (in thousands):
 
 
Three Months Ended March 31,
 
 
2019
 
2018
 
 
Shares
 
Amount
 
Shares
 
Amount
Purchases of treasury shares
 
(72
)
 
$
(14,289
)
 
—

 
$
—

Stock option exercises
 
94

 
6,564

 
350

 
19,298

Employee stock plan purchases
 
15

 
2,349

 
12

 
1,798

Restricted stock units vested, net of withheld shares upon award settlement
 
10

 
$
(1,373
)
 
—

 
$
—