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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 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 June 30
 
Six months ended June 30
 
2019
 
2018
 
2019
 
2018
 
        (in thousands)
Compensation expense
$
1,788

 
$
2,674

 
$
3,348

 
$
4,184

Tax benefit
(412
)
 
(1,075
)
 
(743
)
 
(1,536
)
Stock-based compensation expense, net of tax benefit
$
1,376

 
$
1,599

 
$
2,605

 
$
2,648