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GENERAL (Schedule of Acquired Intangible Assets) (inContact) (Details) - USD ($)
$ in Thousands
 1 Months Ended
Nov. 14, 2016
Mar. 22, 2016
inContact [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Total intangible assets $ 538,000  
inContact [Member] | Trademark [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Total intangible assets $ 36,400  
inContact [Member] | Trademark [Member] | Minimum [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Intangible Estimated useful life 2 years  
inContact [Member] | Trademark [Member] | Maximum [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Intangible Estimated useful life 8 years  
inContact [Member] | Core technology [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Total intangible assets $ 353,700  
inContact [Member] | Core technology [Member] | Minimum [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Intangible Estimated useful life 4 years  
inContact [Member] | Core technology [Member] | Maximum [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Intangible Estimated useful life 8 years  
inContact [Member] | Customer Relationships [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Total intangible assets $ 147,900  
inContact [Member] | Customer Relationships [Member] | Minimum [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Intangible Estimated useful life 5 years  
inContact [Member] | Customer Relationships [Member] | Maximum [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Intangible Estimated useful life 7 years  
Nexidia [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Total intangible assets   $ 63,400
Nexidia [Member] | Trademark [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Total intangible assets   $ 7,500
Intangible Estimated useful life   12 years
Nexidia [Member] | Core technology [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Total intangible assets   $ 17,400
Intangible Estimated useful life   5 years
Nexidia [Member] | Customer Relationships [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Total intangible assets   $ 27,600
Intangible Estimated useful life   6 years
Nexidia [Member] | Customer backlog [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Total intangible assets   $ 10,900
Intangible Estimated useful life   1 year