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FINANCING ARRANGEMENTS (Schedule of Balances Attributable to Notes) (Details) - USD ($)
$ in Thousands
Feb. 28, 2019
Jul. 28, 2018
Jul. 20, 2018
Feb. 28, 2018
May 28, 2015
Debt Instrument [Line Items]          
Net carrying amount of the Convertible Notes $ 275,905     $ 154,299  
2020 Convertible Notes [Member]          
Debt Instrument [Line Items]          
Principal 122,527     172,500  
Less: Unamortized debt discount (6,461)     (16,143)  
Unamortized debt issuance costs (817)     (2,058) $ (4,300)
Net carrying amount of the Convertible Notes 115,249     $ 154,299  
Fair value of the convertible notes     $ 47,600    
2020 Convertible Notes [Member] | Fair Value, Inputs, Level 2 [Member]          
Debt Instrument [Line Items]          
Fair value of the convertible notes 118,680        
2025 Convertible Notes [Member]          
Debt Instrument [Line Items]          
Principal 230,000        
Less: Unamortized debt discount (64,565)        
Unamortized debt issuance costs (4,779) $ (7,300) $ (7,300)    
Net carrying amount of the Convertible Notes 160,656        
2025 Convertible Notes [Member] | Fair Value, Inputs, Level 2 [Member]          
Debt Instrument [Line Items]          
Fair value of the convertible notes $ 184,334