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Share-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2019
Share-based Payment Arrangement [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:
 
Six Months Ended
June 30,
 
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

 
1,265

 
$
22.43

Restricted stock units
371

 
84.84

 
501

 
70.14

Performance share units

 

 
165

 
75.39