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Share Repurchases (Tables)
 6 Months Ended
Jun. 30, 2015
Share Repurchases [Line Items]  
Schedule of Share Repurchases
A summary of share repurchase activity during the three and six months ended June 30, 2015 is as follows:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2015
 
2015
Shares of common stock repurchased
 
3,965,253

 
6,718,418

Spending on share repurchases (in thousands)
 
$
300,079

 
$
500,134

Average price paid per share
 
$
75.68

 
$
74.44