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REPORTABLE SEGMENTS AND GEOGRAPHICAL INFORMATION (Financial Information of The Company's Reportable Segments) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Revenues $ 1,332,152 $ 1,015,542 $ 926,867
Operating income (loss) 150,071 134,176 166,106
Customer Engagement [Member]      
Segment Reporting Information [Line Items]      
Revenues [1] 1,051,350 754,398 [2] 688,060 [2]
Operating income (loss) [1] 175,247 202,893 [2] 206,994 [2]
Financial Crime and Compliance [Member]      
Segment Reporting Information [Line Items]      
Revenues 280,802 261,144 238,807
Operating income (loss) 101,774 89,990 73,131
Not Allocated [Member]      
Segment Reporting Information [Line Items]      
Revenues
Operating income (loss) $ (126,951) $ (158,707) $ (114,019)
[1] Includes the results of a certain operation (formerly part of the Security Solutions segment), which was retained following the above mentioned divestiture and integrated within the Customer Engagement operating segment.
[2] Includes the results of companies which were acquired in 2017 and 2016 and are being integrated within the Customer Engagement segment.