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CONVERTIBLE NOTES (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Mar. 31, 2019
Mar. 08, 2019
Dec. 31, 2018
Jan. 17, 2018
Convertible Notes          
Convertible notes          
Coupon Interest Rate         1.00%
Notes          
Convertible notes          
Coupon Interest Rate   0.375% 0.375%    
Total Convertible notes $ 1,162,602     $ 908,500  
Less: Debt discount (353,283)     (227,403)  
Less: Debt issuance costs (17,149)     (16,348)  
Net convertible debt including current maturities 792,170     664,749  
Less: Current maturities (315,643)        
Net long-term convertible debt $ 476,527     664,749  
2027 Convertible notes          
Convertible notes          
Coupon Interest Rate 0.375%        
Effective interest rate (as a percent) 6.30%        
Fair Value of Liability Component at Issuance $ 472,501        
Total Convertible notes 747,500        
Less: Debt discount $ (260,370)        
2025 Convertible notes          
Convertible notes          
Coupon Interest Rate 1.00%        
Effective interest rate (as a percent) 6.00%        
Fair Value of Liability Component at Issuance $ 299,187        
Total Convertible notes 415,102     908,500  
Less: Debt discount $ (92,913)     (227,403)  
Liability component       654,800  
Equity component       269,700  
Premium       $ 14,200