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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
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

Nine Months Ended
(in thousands, except per share data)
September 30,
2017

September 30,
2016

September 30,
2017

September 30,
2016
Cost of sales:







Software licenses
$
140


$
187


$
711


$
524

Maintenance and service
739


417


1,894


1,200

Operating expenses:







Selling, general and administrative
8,782


4,292


23,310


11,160

Research and development
5,112


4,056


13,493


11,680

Stock-based compensation expense before taxes
14,773


8,952


39,408


24,564

Related income tax benefits
(6,080
)

(2,993
)

(23,980
)

(7,928
)
Stock-based compensation expense, net of taxes
$
8,693


$
5,959


$
15,428


$
16,636

Net impact on earnings per share:







Basic earnings per share
$
(0.10
)

$
(0.07
)

$
(0.18
)

$
(0.19
)
Diluted earnings per share
$
(0.10
)

$
(0.07
)

$
(0.18
)

$
(0.19
)