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SEGMENT INFORMATION (REVENUE GEOGRAPHY) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]          
Sales Revenue Services Net $ 566,734 $ 492,980 $ 1,660,747 $ 1,378,274  
Other long-term assets 70,769   70,769   $ 69,438
United States [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Sales Revenue Services Net 377,211 346,095 1,108,390 936,079  
Philippines [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Sales Revenue Services Net 100,531 82,147 305,255 252,520  
Latin America [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Sales Revenue Services Net 28,737 23,550 85,529 72,002  
Europe Middle East Africa [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Sales Revenue Services Net 28,891 20,772 82,447 55,077  
Asia Pacific[ Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Sales Revenue Services Net 16,989 14,483 49,560 43,377  
Canada [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Sales Revenue Services Net $ 14,375 $ 5,933 $ 29,566 $ 19,219