Annual report pursuant to Section 13 and 15(d)

Assets and Liabilities Measured at Fair Value - Realized and Unrealized Gains (Losses) On Financial Instruments (Details)

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Assets and Liabilities Measured at Fair Value - Realized and Unrealized Gains (Losses) On Financial Instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Realized and Unrealized Gains (Losses) on Financial Instruments      
Realized and unrealized gains (losses) on financial instruments, net $ 1,170 $ 3,659 $ 3,098
Zero-strike call option      
Realized and Unrealized Gains (Losses) on Financial Instruments      
Realized and unrealized gains (losses) on financial instruments, net $ 1,170 $ 3,659 $ 3,098