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Long-Term Debt (Schedule of Debt) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Long-term debt    
Net carrying value $ 295,498 $ 235,683
Less current portion   5,147
Long-term debt, net of current portion 295,498 230,536
Convertible Senior Notes Due 2020    
Long-term debt    
Senior Secured Notes 190,000 250,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net (838) (20,497)
Net carrying value 189,162 229,503
Senior Secured Notes Due 2018    
Long-term debt    
Senior Secured Notes   6,187
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net   (7)
Net carrying value   $ 6,180
Senior Secured Notes Due 2024 member    
Long-term debt    
Senior Secured Notes 110,000  
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net (3,664)  
Net carrying value $ 106,336