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REVENUE Revenue from External Customers by Type (Tables)
 6 Months Ended
Jun. 30, 2019
Revenue from External Customer [Line Items]  
Revenue from External Customers by Products and Services [Table Text Block]
The following table is a summary of our revenues by type for the three and six months ended June 30, 2019 and 2018 (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
Products and solutions net revenues
$
50,326

 
$
46,379

 
$
104,722

 
$
92,789

Subscription services
9,760

 
8,326

 
19,042

 
16,791

Support services
31,638

 
36,076

 
63,657

 
69,836

Professional services, training and other services
6,977

 
7,834

 
14,599

 
17,136

Total net revenues
$
98,701

 
$
98,615

 
$
202,020

 
$
196,552