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Share-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of share-based compensation expense related to share-based awards recorded in the statements of income
The following table summarizes share-based compensation expense related to share-based awards recorded in the condensed consolidated statements of income, pursuant to ASC 718, Stock Compensation:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2018
 
2017
 
2018
 
2017
Cost of software services, maintenance and subscriptions
 
$
2,955

 
$
2,253

 
$
5,731

 
$
4,350

Selling, general and administrative expenses
 
9,978

 
6,648

 
17,759

 
13,227

Total share-based compensation expense
 
$
12,933

 
$
8,901

 
$
23,490

 
$
17,577