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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
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
 
2017
 
2016
 
2017
 
2016
 
(in thousands)
Stock-based compensation expense
$
1,570

 
$
1,552

 
$
3,339

 
$
4,808

Tax benefit
(628
)
 
(536
)
 
(3,312
)
 
(1,611
)
Stock-based compensation expense, net of tax benefit
$
942

 
$
1,016

 
$
27

 
$
3,197