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Summary of Significant Accounting Policies (Fair Value of Derivatives Embedded within Convertible Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Embedded Derivative [Line Items]    
Fair value of derivatives embedded within convertible debt $ 31,424 $ 76,413
Minimum    
Embedded Derivative [Line Items]    
Fair value of derivatives embedded within convertible debt 31,371 76,215
Maximum    
Embedded Derivative [Line Items]    
Fair value of derivatives embedded within convertible debt $ 31,519 $ 76,874