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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [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
 
Six Months Ended
(in thousands, except per share data)
June 30,
2016

June 30,
2015
 
June 30,
2016
 
June 30,
2015
Cost of sales:
 
 
 
 
 
 
 
Software licenses
$
182

 
$
182

 
$
337

 
$
375

Maintenance and service
416

 
486

 
783

 
902

Operating expenses:
 
 
 
 
 
 
 
Selling, general and administrative
3,944

 
4,722

 
6,868

 
8,789

Research and development
3,992

 
3,640

 
7,624

 
6,795

Stock-based compensation expense before taxes
8,534

 
9,030

 
15,612

 
16,861

Related income tax benefits
(2,892
)
 
(2,911
)
 
(4,935
)
 
(5,729
)
Stock-based compensation expense, net of taxes
$
5,642

 
$
6,119

 
$
10,677

 
$
11,132

Net impact on earnings per share:
 
 
 
 
 
 
 
Basic earnings per share
$
(0.06
)
 
$
(0.07
)
 
$
(0.12
)
 
$
(0.12
)
Diluted earnings per share
$
(0.06
)
 
$
(0.07
)
 
$
(0.12
)
 
$
(0.12
)