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Fair Value Measurements (Derivative Summary) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Liability $ 958 $ 958
Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Liability 958 $ 958
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net $ 0