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REVENUE - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Revenue    
Revenues $ 265,763 $ 275,769
Americas    
Revenue    
Revenues 156,075 159,108
Europe    
Revenue    
Revenues 90,739 95,130
Asia Pacific    
Revenue    
Revenues $ 18,949 $ 21,531