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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Compensation Expense and Related Tax Benefits
The following table presents compensation expense and the related tax benefits for equity awards recognized in the Consolidated Statements of Income:
 
Three months ended September 30
 
Nine months ended September 30
 
2019
 
2018
 
2019
 
2018
 
        (in thousands)
Compensation expense
$
2,110

 
$
1,823

 
$
5,458

 
$
6,007

Tax benefit
(451
)
 
(492
)
 
(1,194
)
 
(2,028
)
Stock-based compensation expense, net of tax benefit
$
1,659

 
$
1,331

 
$
4,264

 
$
3,979