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GOODWILL (Schedule of Goodwill) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Nov. 14, 2016
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Line Items]      
Beginning balance, as of January 1   $ 1,284,710 $ 651,112
Acquisitions   24,346 [1] 651,892 [2]
Functional currency translation adjustments   9,186 (18,294)
Ending balance, as of December 31   1,318,242 1,284,710
inContact [Member]      
Goodwill [Line Items]      
Acquisitions $ 559,372 559,372  
Ending balance, as of December 31 $ 559,372    
Customer Engagement [Member]      
Goodwill [Line Items]      
Beginning balance, as of January 1   1,022,198 384,808
Acquisitions   24,346 [1] 651,892 [2]
Functional currency translation adjustments   7,378 (14,502)
Ending balance, as of December 31   1,053,922 1,022,198
Financial Crime and Compliance [Member]      
Goodwill [Line Items]      
Beginning balance, as of January 1   262,512 266,304
Acquisitions   [1] [2]
Functional currency translation adjustments   1,808 (3,792)
Ending balance, as of December 31   $ 264,320 $ 262,512
[1] Includes a reduction of $3,799 of goodwill in respect of 2016 acquisition resulted from a finalization of purchase price allocation.
[2] including a goodwill balance of $559,372 related to the acquisition of inContact.