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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2015
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
 
2015
 
2014
 
2015
 
2014
 
(in thousands)
Stock-based compensation expense
$
1,533

 
$
1,288

 
$
4,371

 
$
4,310

Tax benefit
(489
)
 
(358
)
 
(1,403
)
 
(1,067
)
Stock-based compensation expense, net of tax
$
1,044

 
$
930

 
$
2,968

 
$
3,243