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Share-Based Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of share-based compensation expense included in net income
A summary of share-based compensation expense included in net income is as follows:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2018
 
2017
 
2018
 
2017
 
(In thousands)
Grants of common shares and options
$
3,274

 
$
2,908

 
$
7,144

 
$
6,457

Capitalized share-based compensation
(488
)
 
(381
)
 
(926
)
 
(698
)
Share-based compensation expense
$
2,786

 
$
2,527

 
$
6,218

 
$
5,759