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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 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 March 31
 
2015
 
2014
 
(in thousands)
Stock-based compensation expense
$
1,071

 
$
1,033

Tax benefit
(292
)
 
(263
)
Stock-based compensation expense, net of tax
$
779

 
$
770