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Assets and Liabilities Measured at Fair Value (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
Realized and Unrealized Gains (Losses) on Financial Instruments  
Realized and unrealized gains (losses) $ 981
Zero-strike call option  
Realized and Unrealized Gains (Losses) on Financial Instruments  
Realized and unrealized gains (losses) $ 981