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REPORTABLE SEGMENTS AND GEOGRAPHICAL INFORMATION (Schedule of Total Revenues from External Customers by Geographical Areas) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues $ 1,648,016 $ 1,573,912 $ 1,444,519
Americas, principally the US      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 1,353,278 1,234,549 1,123,866
EMEA      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 180,177 212,252 202,521
Israel      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 4,368 3,950 4,402
Asia Pacific      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues $ 110,193 $ 123,161 $ 113,730