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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2019
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
(in thousands, except per share data)
March 31,
2019

March 31,
2018
Cost of sales:



Maintenance and service
$
1,228


$
1,010

Operating expenses:
 


Selling, general and administrative
13,131


8,278

Research and development
9,441


5,981

Stock-based compensation expense before taxes
23,800


15,269

Related income tax benefits
(11,076
)

(11,304
)
Stock-based compensation expense, net of taxes
$
12,724


$
3,965

Net impact on earnings per share:
 


Basic earnings per share
$
(0.15
)

$
(0.05
)
Diluted earnings per share
$
(0.15
)

$
(0.05
)