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Stock-Based Compensation
 9 Months Ended
Sep. 30, 2019
Share-based Payment Arrangement [Abstract]  
Stock-Based Compensation
Stock-Based Compensation
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,
2019

September 30,
2018

September 30,
2019

September 30,
2018
Cost of sales:







Maintenance and service
$
2,422


$
1,438


$
6,024


$
3,880

Operating expenses:




 


Selling, general and administrative
16,774


13,484


44,408


33,288

Research and development
12,666


8,061


34,352


21,719

Stock-based compensation expense before taxes
31,862


22,983


84,784


58,887

Related income tax benefits
(9,847
)

(8,611
)

(30,075
)

(30,311
)
Stock-based compensation expense, net of taxes
$
22,015


$
14,372


$
54,709


$
28,576

Net impact on earnings per share:




 


Basic earnings per share
$
(0.26
)

$
(0.17
)

$
(0.65
)

$
(0.34
)
Diluted earnings per share
$
(0.26
)

$
(0.17
)

$
(0.64
)

$
(0.33
)