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DEBT - OUTSTANDING CONVERTIBLE DEBENTURE SCHEDULE (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Aug. 27, 2009
Debt Instrument [Line Items]      
Principal Balance $ 1,362,784    
Debt Instrument, Unamortized Discount (513)    
Total long-term debt 1,362,271    
Convertible Debt      
Debt Instrument [Line Items]      
Debt Instrument, Unamortized Discount $ 0 $ (163,316) $ (181,200)