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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Compensation Expense and Related Tax Benefits
The following table presents compensation (benefit) 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
 
2017
 
2016
 
2017
 
2016
 
(in thousands)
Stock-based compensation expense
$
1,035

 
$
1,820

 
$
1,769

 
$
3,256

Tax benefit
(1,940
)
 
(642
)
 
(2,684
)
 
(1,075
)
Stock-based compensation expense, net of tax benefit
$
(905
)
 
$
1,178

 
$
(915
)
 
$
2,181