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DEBT - OUTSTANDING CONVERTIBLE DEBENTURE SCHEDULE (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Aug. 27, 2009
Debt Instrument [Line Items]      
Principal Balance $ 1,402,551    
Debt Instrument, Unamortized Discount (770)    
Total long-term debt 1,401,781    
Convertible Debt      
Debt Instrument [Line Items]      
Principal Balance 0 $ 344,873  
Debt Instrument, Unamortized Discount 0 (163,316) $ (181,200)
Total long-term debt $ 0 $ 181,557