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Stock-Based Compensation
 3 Months Ended
Mar. 31, 2022
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
(in thousands, except per share data)March 31,
2022		March 31,
2021
Cost of sales:
Maintenance and service$2,563 $3,562 
Operating expenses:
Selling, general and administrative20,444 17,223 
Research and development12,644 14,334 
Stock-based compensation expense before taxes35,651 35,119 
Related income tax benefits(24,888)(42,625)
Stock-based compensation expense, net of taxes$10,763 $(7,506)
Net impact on earnings per share:
Basic earnings per share$(0.12)$0.09 
Diluted earnings per share$(0.12)$0.09 

Stock-based compensation was a net benefit for the three months ended March 31, 2021 as the tax benefits on stock-based compensation exceeded the gross stock-based compensation expense due to increased excess tax benefits recognized related to awards issued in prior periods that were either exercised or released in the period.