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Share-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of stock option, restricted stock unit and performance share unit activity
A summary of stock option, restricted stock unit and performance share unit grant activity is as follows:
 
Three Months Ended
March 31,
 
2019
 
2018
 
Shares Granted
(In thousands)
 
Weighted-Average Grant Date Fair Value
 
Shares Granted
(In thousands)
 
Weighted-Average Grant Date Fair Value
Stock options
1,171

 
$
28.43

 
1,193

 
$
22.40

Restricted stock units
317

 
84.34

 
374

 
69.77

Performance share units

 

 
165

 
75.39