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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 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 March 31
 
2019
 
2018
 
        (in thousands)
Compensation expense
$
1,560

 
$
1,510

Tax benefit
(331
)
 
(461
)
Stock-based compensation expense, net of tax benefit
$
1,229

 
$
1,049