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CONVERTIBLE NOTES (Schedule of Net Carrying Amount) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net carrying value $ 358,715 $ 337,777  
Amortization of debt discount and issuance costs 20,938 10,004
Convertible Notes [Member]      
Principal outstanding 442,750 442,750  
Unamortized debt discount (77,527) (96,371)  
Unamortized debt issuance costs (6,508) (8,602)  
Net carrying value 358,715 337,777  
Amount allocated to conversion option 105,375 105,375  
Less: allocated issuance costs and Capped call (48,337) (48,337)  
Equity component, net 57,038 57,038  
Amortization of debt discount and issuance costs $ 20,938 $ 10,004