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LONG-TERM DEBT AND COMMITMENTS (Schedule of Debt) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Long-term debt    
Senior Secured Notes $ 284,643  
Less: Debt issuance costs (2,501)  
Less: Discount on convertible senior notes (43,251)  
Net carrying value 238,891  
Less: Current Portion (9,015) $ (14,356)
Long-term debt, net of current portion 229,876 $ 217,034
Convertible Senior Notes Due 2020    
Long-term debt    
Senior Secured Notes 250,000  
Senior Secured Notes Due 2018    
Long-term debt    
Senior Secured Notes 34,643  
2016 (remaining three months) 8,875  
2017 23,750  
2018 38,376  
Total 71,001  
Less: Interest portion $ (36,358)