Annual report pursuant to Section 13 and 15(d)

COMMITMENTS AND CONTINGENT LIABILITIES (Loss Contingencies) (Details)

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COMMITMENTS AND CONTINGENT LIABILITIES (Loss Contingencies) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Loss Contingencies [Line Items]    
Accrual for costs of litigation settlement $ 110.0  
Songkick Litigation [Member] | Settled Litigation [Member]    
Loss Contingencies [Line Items]    
Accrual for costs of litigation settlement   $ 110.0