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DEBT - OUTSTANDING CONVERTIBLE DEBENTURE SCHEDULE (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Aug. 27, 2009
Debt Instrument [Line Items]    
Principal Balance $ 1,233,256  
Debt Instrument, Unamortized Discount (156)  
Total long-term debt $ 1,233,100  
Convertible Debt    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount   $ (181,200)