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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2014
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 June 30
 
Six months ended June 30
 
2014
 
2013
 
2014
 
2013
 
(in thousands)
Stock-based compensation expense
$
1,989

 
$
2,360

 
$
3,022

 
$
3,207

Tax benefit
(446
)
 
(687
)
 
(709
)
 
(911
)
Stock-based compensation expense, net of tax
$
1,543

 
$
1,673

 
$
2,313

 
$
2,296