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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2016
Share-based Compensation [Abstract]  
Stock-Based Compensation Expense and Its Net Impact on Basic and Diluted Earnings Per Share
Total stock-based compensation expense and its net impact on basic and diluted earnings per share are as follows:
 
Three Months Ended
(in thousands, except per share data)
March 31,
2016

March 31,
2015
Cost of sales:
 
 
 
Software licenses
$
155

 
$
193

Maintenance and service
367

 
416

Operating expenses:
 
 
 
Selling, general and administrative
2,924

 
4,067

Research and development
3,632

 
3,155

Stock-based compensation expense before taxes
7,078

 
7,831

Related income tax benefits
(2,043
)
 
(2,818
)
Stock-based compensation expense, net of taxes
$
5,035

 
$
5,013

Net impact on earnings per share:
 
 
 
Basic earnings per share
$
(0.06
)
 
$
(0.06
)
Diluted earnings per share
$
(0.06
)
 
$
(0.05
)