Quarterly report pursuant to Section 13 or 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
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Realized and Unrealized Gains (Losses) on Financial Instruments          
Realized and unrealized gains (losses) on financial instruments, net   $ (39,324) $ (433) $ (39,324) $ (433)
Zero-strike call option          
Realized and Unrealized Gains (Losses) on Financial Instruments          
Realized and unrealized gains (losses) on financial instruments, net     (433)   (433)
Number of shares for which zero-strike call option was entered 460,675        
Premium prepaid $ 46,300   $ 46,300   $ 46,300
Exchangeable Senior Debentures          
Realized and Unrealized Gains (Losses) on Financial Instruments          
Realized and unrealized gains (losses) on financial instruments, net   (39,324)   (39,324)  
Change in fair value   $ 15,300   $ 15,300