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SEGMENT INFORMATION (REVENUE GEOGRAPHY) (DETAILS) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]          
Sales Revenue Services Net $ 305,105 $ 310,223 $ 617,515 $ 635,744  
Other long-term assets 45,526   45,526   $ 42,486
United States [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Sales Revenue Services Net 166,249 157,740 340,827 329,393  
Philippines [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Sales Revenue Services Net 84,910 85,585 169,204 170,572  
Latin America [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Sales Revenue Services Net 29,164 37,623 59,322 78,177  
Europe Middle East Africa [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Sales Revenue Services Net 17,004 19,290 33,497 38,603  
Asia Pacific[ Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Sales Revenue Services Net 6,886 8,437 12,536 16,111  
Canada [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Sales Revenue Services Net $ 892 $ 1,548 $ 2,129 $ 2,888